OnePlus 9 vs Xiaomi 12X - Detailed Phone Comparison

Detailed Comparison

Specification
OnePlus 9
OnePlus 9
Oneplus
Xiaomi 12X
Xiaomi 12X
Xiaomi

General

Launch Date March 26, 2021 December 31, 2021
Release Year 2021 2021

Physical

Volume 103.29 cm³ 87.52 cm³
Screen Size to Weight Ratio 3.41 "/g 3.57 "/g
Weight 192 g 176 g
Height 160 mm 152.7 mm
Width 74.2 mm 69.9 mm
Thickness 8.7 mm 8.2 mm
Foldable Design No No
Available Colors
  • Winter Mist
  • Arctic Sky
  • Astral Black
  • Blue
  • Purple
  • Gray

Display

Screen Size 6.55 " 6.28 "
Resolution 1080 x 2400 1080 x 2400
Aspect Ratio 20:9 20:9
Screen-to-Body Ratio 87.2 % 89.2 %
Pixel Density 402 PPI 419 PPI
Refresh Rate 120 Hz 120 Hz
Typical Brightness N/A N/A
HBM Brightness N/A N/A
Peak Brightness 1100 nits 1100 nits

Hardware

Battery Capacity per Screen Area 104.89 mAh/in² 114.10 mAh/in²
Battery Density 43.57 mAh/cm³ 51.41 mAh/cm³
Battery Capacity 4500 mAh 4500 mAh
NFC Support Yes Yes
Chipset Qualcomm SM8350 Snapdragon 888 5G (5 nm) Qualcomm SM8250-AC Snapdragon 870 5G (7 nm)
CPU Octa-core (1x2.84 GHz Cortex-X1 & 3x2.42 GHz Cortex-A78 & 4x1.80 GHz Cortex-A55) Octa-core (1x3.2 GHz Kryo 585 & 3x2.42 GHz Kryo 585 & 4x1.80 GHz Kryo 585)
GPU Adreno 660 Adreno 650

Connectivity

USB Version 3.1 2.0
OTG Support 1 1
DisplayPort
DisplayPort Version N/A N/A
USB Features USB Type-C 3.1, OTG USB Type-C 2.0, OTG

Software

Operating System Android Android
Initial OS Version 11 11
Maximum OS Version 13

Comparison Summary

1. Specifications Comparison

Here's a detailed comparison of the OnePlus 9 and Xiaomi 12X specifications, focusing on practical impacts:

Design

FeatureOnePlus 9Xiaomi 12XPractical Impact
Dimensions160 × 74.2 × 8.7 mm152.7 × 69.9 × 8.2 mmXiaomi 12X is more compact and easier to handle, particularly for smaller hands. OnePlus 9 is slightly larger and may be less comfortable for one-handed use.
Weight192g176gXiaomi 12X is noticeably lighter, making it more comfortable for extended use and pocketable.
Build Quality (Screen)Corning Gorilla Glass 5Corning Gorilla Glass VictusXiaomi 12X offers superior scratch and drop resistance due to newer Gorilla Glass Victus.

Display

FeatureOnePlus 9Xiaomi 12XPractical Impact
Size6.55"6.28"OnePlus 9 offers a slightly larger viewing area, which is better for media consumption and gaming. Xiaomi 12X's smaller display is more pocket-friendly and may be preferred for those who prioritize portability.
Resolution1080x24001080x2400Both offer sharp images and text, making the visual experience similar.
Pixel Density402 PPI419 PPIBoth have very similar pixel density offering sharp images, but the difference is unlikely to be noticed by the naked eye.
TechnologyAMOLEDAMOLEDBoth offer vibrant colors, deep blacks, and excellent contrast ratio.
Refresh Rate120Hz120HzBoth provide smooth scrolling and animations, enhancing overall fluidity.
Brightness1100 nits1100 nitsBoth are easily visible outdoors even under direct sunlight.

Performance

FeatureOnePlus 9Xiaomi 12XPractical Impact
ChipsetQualcomm Snapdragon 888 5G (5 nm)Qualcomm Snapdragon 870 5G (7 nm)OnePlus 9 has a marginally faster processor, resulting in slightly better performance in demanding tasks and gaming.
AnTuTu Score880,900815,210OnePlus 9 benchmarks slightly higher, translating to a smoother experience during heavy usage.
GPUAdreno 660Adreno 650OnePlus 9 has a more powerful GPU, providing better graphics performance in demanding games and apps.

Camera

FeatureOnePlus 9Xiaomi 12XPractical Impact
Main Camera48MP, f/1.79, 1/1.4" Sony IMX68950MP, f/1.88, 1/1.56" Sony IMX766OnePlus 9's larger sensor size and wider aperture means it can capture more light, resulting in better low-light performance and potentially less noise. Xiaomi 12X offers higher pixel count but has a smaller sensor, which might have a disadvantage in low light.
Selfie Camera16MP, f/2.4, 1/3.13" Sony IMX47132MP, f/2.45, 1/3" Omnivision OV32BXiaomi 12X has a higher resolution selfie camera with a slightly smaller sensor, which will provide more detailed selfies but may not perform as well in low light.
Wide Angle Lens50MP, f/2.2, 1/1.56" Sony IMX76613MP, f/2.4, 1/3.06" Omnivision OV13B10OnePlus 9 offers a significantly higher resolution wide angle lens with a larger sensor, leading to superior image quality when capturing wide shots.
Macro LensN/A5MP, f/2.4, SamsungXiaomi 12X provides a dedicated macro lens for close-up shots, a feature missing on the OnePlus 9.
Black & White Lens2MP, f/2.4N/AOnePlus 9 has a dedicated black and white lens for enhanced monochrome photos, a feature missing on the Xiaomi 12X.
VideoUp to 8K@30fps, HDR, EIS, 4K@60fps HDRUp to 8K@24fps, EIS, 4K@60fpsBoth offer high quality video recording. OnePlus 9 supports higher frame rate at 8K (30fps vs. 24fps), but lacks OIS in video recordings. Xiaomi 12X offers Optical Image Stabilization (OIS) for steadier footage.
Stabilization TechEIS (Electronic Image Stabilization)OIS (Optical Image Stabilization)Xiaomi 12X has more sophisticated stabilization for videos with less shaky footage.
Slow Motion480 fps960 fpsXiaomi 12X offers more slow-motion capabilities.

Battery

FeatureOnePlus 9Xiaomi 12XPractical Impact
Capacity4500mAh4500mAhBoth should offer similar battery life, assuming usage patterns are comparable.
Charging65W fast charging, 15W Wireless Charging67W fast chargingXiaomi 12X offers slightly faster wired charging. OnePlus 9 has the added convenience of 15W wireless charging.
Battery TypeLi-PolymerLi-PolymerBoth use same battery technology

Other

FeatureOnePlus 9Xiaomi 12XPractical Impact
Operating SystemAndroid 11, upgradable to Android 13Android 11, no clear upgrade pathOnePlus 9 is confirmed to receive software updates and has a clearly defined path to Android 13, while the Xiaomi 12X’s update path is uncertain, which might lead to outdated software experience in the long run.
WiFiWiFi 6WiFi 6Both offer the latest WiFi standards, ensuring fast and stable connectivity.
Bluetooth5.25.1OnePlus 9 has a newer version with slightly better power efficiency and reliability.
GPSMore satellite systems for better location accuracyMore satellite systems for better location accuracyBoth phones offer accurate GPS, with each supporting slightly different satellite systems for optimal performance in diverse regions.
AudioDolby Atmos, Noise cancellation microphone, Stereo Speakers, 3 microphonesDolby Atmos, Hi-Res Audio, Stereo Speakers, 2 microphonesOnePlus 9 offers better voice capture and noise cancellation for clearer audio, while Xiaomi 12X has Hi-Res Audio support for a better music experience.
Storage & RAM128/256GB, 8/12GB RAM128/256GB, 8/12GB RAMBoth offer ample storage and RAM options for multitasking and app usage.
Expandable StorageNoNoNeither phone offers external storage.
SecurityBasic Fingerprint SensorBasic Fingerprint SensorBoth phones have similar fingerprint sensor technology
SensorsFingerprint, Proximity, Accelerometer, Compass, GyroscopeFingerprint, Accelerometer, Compass, Gyroscope, Ultrasonic proximity virtualBoth offer similar suite of sensors. OnePlus 9 has a normal proximity sensor while the Xiaomi 12X uses an ultrasonic one.

2. Key Differences Analysis

Here's a breakdown of the major advantages of each phone:

OnePlus 9 Advantages:

  • Superior Main Camera: Larger sensor and wider aperture for better low-light photography and overall image quality.
  • Superior Wide-Angle Camera: Significantly higher resolution and larger sensor for better wide shots.
  • Marginally Better Performance: More powerful chipset and GPU for smoother performance, particularly in gaming and demanding tasks.
  • Wireless Charging: Convenience of 15W wireless charging option.
  • Software Support: Clear upgrade path to Android 13.
  • Better Audio Recording: Enhanced noise cancellation and an extra microphone for clearer calls and audio capture.

Practical Implications: The OnePlus 9 excels in photography, particularly in low light and with its wide-angle lens. It also offers a slight edge in performance and the convenience of wireless charging. Its confirmed path to Android 13 ensures a more modern software experience.

Xiaomi 12X Advantages:

  • More Compact Design: Smaller size and lighter weight make it more comfortable to handle and carry.
  • Superior Screen Protection: Corning Gorilla Glass Victus offers better durability.
  • Faster Wired Charging: Slightly faster 67W fast charging for quicker battery top-ups.
  • Dedicated Macro Lens: Ability to take close-up photos which OnePlus 9 cannot
  • Optical Image Stabilization: OIS provides more steady video recordings.
  • Hi-Res Audio: Offers a better music experience through higher audio quality.
  • Higher Slow Motion Capabilities: 960 fps for dramatic slow-motion videos.

Practical Implications: The Xiaomi 12X is a more pocketable, durable phone with superior screen protection. It provides more flexible camera options, including macro photography and better video stabilization. The slightly faster wired charging and Hi-Res audio cater to users who value convenience and media consumption.

Significant Trade-offs:

  • OnePlus 9 lacks OIS and a dedicated macro camera lens.
  • Xiaomi 12X's wide-angle camera is inferior, does not have wireless charging and its software update path is uncertain.
  • OnePlus 9 is slightly bulkier and heavier than Xiaomi 12X.

3. User Profiles & Recommendations

OnePlus 9 Ideal User:

  • Photography Enthusiasts: Users who prioritize high-quality images, especially in low-light conditions and with the wide-angle lens.
  • Gamers: Individuals who need a phone with powerful performance for demanding games and applications.
  • Media Consumers: Those who value larger displays, the ability to capture good quality audio and wireless charging.
  • Users who value software updates: Individuals who prefer devices with clear and defined software upgrade paths.

Use Cases:

  • Capturing high-quality photos and videos, especially in challenging lighting conditions.
  • Playing graphically intensive mobile games.
  • Watching movies and TV shows on a slightly larger display
  • Wanting a phone with updated software.

Xiaomi 12X Ideal User:

  • Users who prioritize portability and comfort: Users with smaller hands or those who prefer lighter and smaller phones.
  • Users who are prone to dropping their phone: Those who need better screen protection for durability.
  • Media Lovers: Users who want to use their smartphone for music consumption and prefer Optical Image Stabilization for steady videos.
  • Macro Photography Enthusiasts: Those who want a dedicated macro lens for close-up shots.
  • Users who prefer faster charging: Users who prioritize slightly faster charging times.

Use Cases:

  • Taking photos with the dedicated macro camera, and stable videos using OIS
  • Using the phone comfortably for extended periods due to its lighter weight.
  • Enjoying high-quality audio output and slightly faster charging.

Price-to-Value Ratio:

The price-to-value ratio will depend on current pricing. Generally, if the price difference is negligible, the OnePlus 9 offers a stronger camera system and slightly better performance. If you value a smaller size and improved screen durability, along with a decent camera and faster wired charging, the Xiaomi 12X may provide a more suitable price-to-value ratio.

4. Decision Framework

Here are 3 key questions to guide your decision:

  1. How much do you value camera performance?
    • If the camera is a top priority, especially in low light and wide-angle scenarios, the OnePlus 9 is superior.
  2. What is more important: portability or power?
    • If a smaller, lighter phone is important, choose Xiaomi 12X. If a slightly bigger screen, better performance and better audio recording is preferable, choose the OnePlus 9
  3. Do you prioritize wireless charging or faster wired charging?
    • If you want the convenience of wireless charging, choose OnePlus 9. If you prefer a bit faster wired charging, choose Xiaomi 12X.

Scenario-Based Recommendations:

  • For the Photography Enthusiast: If you take photos regularly and want the best possible quality, especially in low light, the OnePlus 9 is the better choice.
  • For the Frequent Traveler: If you need a compact, lightweight phone with great screen protection and the ability to take macro photos, the Xiaomi 12X is a more practical option.
  • For the Mobile Gamer: If you value performance, better audio recording capabilities, and larger displays for gaming, go with the OnePlus 9.
  • For the Media Consumer: If you need a slightly more pocketable phone with high-quality audio, OIS, the Xiaomi 12X may suit your needs best. If you value bigger screen size, wireless charging, a better overall camera system, the OnePlus 9 may suit you best.

Final Recommendation

If I had to choose, I would pick the OnePlus 9. While the Xiaomi 12X has its merits, especially in terms of compact size, screen protection, and OIS, the OnePlus 9 offers a more compelling package for my specific preferences. My rationale is as follows:

  1. Superior Camera System: The larger sensor size and wider aperture of the OnePlus 9's main camera, combined with the excellent wide-angle lens, are crucial for my photography needs.
  2. Slightly Better Performance: I often use my phone for demanding tasks, and the Snapdragon 888 provides that extra boost in power I'm looking for.
  3. Wireless Charging: The convenience of wireless charging aligns well with my lifestyle.
  4. Better Software Support: Knowing the OnePlus 9 has a defined update path to Android 13 ensures long term usability.
  5. Better Audio Recording Capabilities: Having an additional microphone combined with noise cancellation features would ensure better voice capture during calls and recordings.

Although the Xiaomi 12X is more compact, has better screen protection, and OIS, I would prioritize the OnePlus 9's overall camera system, wireless charging, better software support, and audio capabilities.

Emily Harper
Emily Harper

Technology Insights Specialist

Dedicated technology writer specializing in mobile device analysis and technology communication. Expert at translating complex smartphone features into clear, actionable insights for diverse audiences.

Key Strengths:

  • Mobile technology analysis
  • Digital media communication
  • Technical storytelling
  • User-centric technology insights

Bridging technical complexity with engaging, accessible narratives.