Xiaomi Poco X3 Pro vs OnePlus 9 - Detailed Phone Comparison

Detailed Comparison

Specification
OnePlus 9
OnePlus 9
Oneplus

General

Launch Date March 24, 2021 March 26, 2021
Release Year 2021 2021

Physical

Volume 119.33 cm³ 103.29 cm³
Screen Size to Weight Ratio 3.1 "/g 3.41 "/g
Weight 215 g 192 g
Height 165.3 mm 160 mm
Width 76.8 mm 74.2 mm
Thickness 9.4 mm 8.7 mm
Foldable Design No No
Available Colors
  • Phantom Black
  • Frost Blue
  • Metal Bronze
  • Winter Mist
  • Arctic Sky
  • Astral Black

Display

Screen Size 6.67 " 6.55 "
Resolution 1080 x 2400 1080 x 2400
Aspect Ratio 20:9 20:9
Screen-to-Body Ratio 84.6 % 87.2 %
Pixel Density 395 PPI 402 PPI
Refresh Rate 120 Hz 120 Hz
Typical Brightness 450 nits N/A
HBM Brightness N/A N/A
Peak Brightness N/A 1100 nits

Hardware

Battery Capacity per Screen Area 115.98 mAh/in² 104.89 mAh/in²
Battery Density 43.24 mAh/cm³ 43.57 mAh/cm³
Battery Capacity 5160 mAh 4500 mAh
NFC Support Yes Yes
Chipset Qualcomm Snapdragon 860 (7 nm) Qualcomm SM8350 Snapdragon 888 5G (5 nm)
CPU Octa-core (1x2.96 GHz Kryo 485 Gold & 3x2.42 GHz Kryo 485 Gold & 4x1.78 GHz Kryo 485 Silver) Octa-core (1x2.84 GHz Cortex-X1 & 3x2.42 GHz Cortex-A78 & 4x1.80 GHz Cortex-A55)
GPU Adreno 640 Adreno 660

Connectivity

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

Software

Operating System Android Android
Initial OS Version 11 11
Maximum OS Version 12 13

Comparison Summary

1. Specifications Comparison

FeatureXiaomi Poco X3 ProOnePlus 9Practical Impact
Design
Dimensions165.3 x 76.8 x 9.4 mm160 x 74.2 x 8.7 mmPoco X3 Pro is larger and bulkier, OnePlus 9 is more compact and pocketable.
Weight215g192gOnePlus 9 is noticeably lighter, making it more comfortable for long-term use.
Display
Size6.67"6.55"Poco X3 Pro has a slightly larger screen, good for media consumption.
Resolution1080 x 24001080 x 2400Both provide similar sharpness.
PPI395402Negligible difference in pixel density, both are sharp.
TechnologyIPS LCDAMOLEDOnePlus 9 has superior display with deeper blacks, vibrant colors, and better power efficiency for dark themes.
Refresh Rate120Hz120HzBoth offer smooth scrolling and gaming.
Brightness0 nits1100 nitsOnePlus 9's display is much more visible under bright sunlight.
Performance
ChipsetQualcomm Snapdragon 860 (7nm)Qualcomm Snapdragon 888 5G (5nm)OnePlus 9 has a much more powerful processor, leading to faster app loading and smoother performance in demanding tasks.
AnTuTu Score627,869880,900OnePlus 9 offers significantly better overall performance according to benchmark scores.
GPUAdreno 640Adreno 660OnePlus 9 has a faster GPU, resulting in better gaming performance.
Camera
Main Camera48MP, f/1.79, 1/2" Sony IMX58248MP, f/1.79, 1/1.4" Sony IMX689OnePlus 9 has a larger sensor, allowing for better low-light performance and higher image quality.
Selfie Camera20MP, f/2.2, 1/3.4" Samsung S5K3T216MP, f/2.4, 1/3.13" Sony IMX471Poco X3 Pro has higher resolution, OnePlus 9 has slightly larger sensor for better low-light selfies
Wide Angle Lens8MP, f/2.2, 1/4" Omnivision OV885650MP, f/2.2, 1/1.56" Sony IMX766OnePlus 9's wide-angle lens offers significantly higher resolution and sensor size, capturing much better images
Portrait Mode (Depth)2MP, f/2.4, 1/5" Omnivision OV02B1BN/APoco X3 Pro has a dedicated depth sensor for portrait shots.
Macro Lens2MP, f/2.4, 1/5" Hynix HI-259N/APoco X3 Pro has a dedicated macro lens for close-up photography.
Black & White LensN/A2MP, f/2.4OnePlus 9 has a dedicated black and white lens for artistic photos.
VideoUp to 4K@30fpsUp to 8K@30fpsOnePlus 9 supports much higher video resolution and HDR recording, leading to better video quality.
DxOMark ScoreN/AN/ADxOMark scores are not available for either phone, so can't determine camera performance.
Camera FeaturesQuadruple Camera, Digital StabilizationTriple Camera, Ultra-stable Video, PDAF, CDAF, Night Mode, RAW 12 bitsOnePlus 9 offers advanced features like night mode, ultra-stable video, and better autofocus.
Battery
Capacity5160 mAh4500 mAhPoco X3 Pro has a larger battery, which should translate to longer battery life.
Charging33W Fast Charging65W Fast Charging, 15W WirelessOnePlus 9 offers significantly faster charging, plus it has wireless charging capabilities.
Battery FeaturesNon-removableNon-removable, 15W Wireless ChargingOnePlus 9 supports wireless charging.
Software
OSAndroid 11 (Upgradable to 12)Android 11 (Upgradable to 13)OnePlus 9 receives one more OS update.
Connectivity
WiFiWi-Fi 5Wi-Fi 6OnePlus 9 supports the newer Wi-Fi 6 standard, offering better speed and stability.
Bluetooth5.05.2OnePlus 9 has a more recent Bluetooth version, potentially offering better range and efficiency.
GPSGPS, A-GPS, GLONASS, Beidou, GalileoGPS, A-GPS, GLONASS, Beidou, Galileo, L1+L5, B1, E1+E5a, B2OnePlus 9 supports more GPS bands, leading to more accurate positioning.
SIMDual SIM Dual StandbyDual SIM Dual StandbyBoth support dual SIM cards.
Storage
Internal128GB/256GB128GB/256GBBoth have similar storage options.
RAM6GB/8GB8GB/12GBOnePlus 9 can have more RAM, offering better multitasking.
Expandable StorageNoNoNeither phone has expandable storage.
Audio
QualityHi-Res Audio, Stereo SpeakersDolby Atmos, Noise cancellation microphone, Stereo Speakers, 3 MicrophonesOnePlus 9 offers more advanced audio features, including Dolby Atmos and noise cancellation.
Security
FeaturesSide-mounted FingerprintIn-display Fingerprint SensorPoco X3 Pro has side-mounted while OnePlus 9 has in-display fingerprint sensor.
Build Quality
Screen ProtectionCorning Gorilla Glass 6Corning Gorilla Glass 5Xiaomi Poco X3 Pro has better screen protection.
Sensors
Ultrasonic Proximity Virtual, Accelerometer, Compass, Gyroscope, FingerprintProximity, Accelerometer, Compass, Gyroscope, FingerprintBoth phones have similar sensors.

2. Key Differences Analysis

Xiaomi Poco X3 Pro Advantages:

  • Larger Battery: Offers longer battery life for users who need all-day performance.
  • Side-Mounted Fingerprint Sensor: Some users may prefer the side-mounted sensor for speed and ergonomics.
  • Dedicated Macro and Depth Sensors: Provides more camera versatility.
  • Better Screen Protection: Has Corning Gorilla Glass 6 vs 5.
  • Lower Cost: Generally more affordable, offering great value for budget-conscious users.

OnePlus 9 Advantages:

  • Superior Display: AMOLED screen provides better contrast, deeper blacks, and vibrant colors.
  • Much Stronger Processor: Snapdragon 888 offers significantly better performance in demanding tasks.
  • Faster Charging & Wireless Charging: Significantly faster charging, plus the added convenience of wireless charging.
  • Better Main & Wide Angle Cameras: Larger sensors and better image processing lead to superior image and video quality.
  • Advanced Camera Features: Features like 8K video, ultra-stable video, night mode, and RAW 12-bit capture make it a more capable camera phone.
  • More RAM: The option for 12GB of RAM allows for much smoother multitasking.
  • Better Connectivity: Supports newer WiFi and Bluetooth versions for faster, more stable connections.
  • Better Audio: Enhanced audio quality with Dolby Atmos and noise cancellation microphone.

Trade-offs:

  • Poco X3 Pro: Sacrifices display quality, camera performance, processor, and fast charging for a lower price and larger battery.
  • OnePlus 9: Higher price, smaller battery, and lacks dedicated macro/depth sensors

3. User Profiles & Recommendations

Xiaomi Poco X3 Pro:

  • Ideal User: Budget-conscious users, gamers who prioritize battery life, users who need basic camera functionalities.
  • Use Cases:
    • Long gaming sessions without worrying about battery life.
    • Daily use for social media, browsing, and calls.
    • Casual photography for social media.
    • Students or individuals who need a reliable phone without breaking the bank.
  • Price-to-Value: Provides excellent value for the price point, especially for performance within its class.

OnePlus 9:

  • Ideal User: Users who prioritize performance, display quality, and camera capabilities.
  • Use Cases:
    • Mobile photography enthusiasts who want high-quality images and videos.
    • Users who perform intensive tasks and multitasking, and high end gaming.
    • Professionals who need reliable performance and fast charging.
    • Users who appreciate a premium experience with a high-quality display and build.
  • Price-to-Value: Justified by premium features and performance, but comes at a higher price tag.

4. Decision Framework

Key Questions:

  1. What is my primary use case? (Gaming, photography, daily use, productivity)
  2. What is my budget? (Are you willing to pay a premium for better features, or are you on a strict budget?)
  3. Which features are most important to me? (Display quality, camera capabilities, battery life, performance, build quality)

Scenario-Based Recommendations:

  • Scenario 1: Budget Gamer: If your budget is limited and your main concern is gaming performance along with good battery life, the Xiaomi Poco X3 Pro is a good pick.
  • Scenario 2: Camera Enthusiast: If photography is crucial, the OnePlus 9's superior cameras, 8K video recording, and RAW capabilities will be worth the higher price.
  • Scenario 3: Performance User: If you need maximum performance for demanding tasks and prefer a smoother experience overall, the OnePlus 9 with its superior processor and higher RAM is the better choice.
  • Scenario 4: Casual User on a Budget: If you want a decent, all-around phone for everyday tasks without overspending, the Poco X3 Pro is a very reasonable choice.
  • Scenario 5: Display Quality Matters Most: If a high-quality screen is your top priority, for media consumption, or content creation, the OnePlus 9 is the only choice with it's superior AMOLED display.
  • Scenario 6: All-Day Battery is Key: If you need a phone that can easily last a full day, the Xiaomi Poco X3 Pro is a solid choice, thanks to it's much bigger battery.

My Choice

If I had to choose, I would go for the OnePlus 9. Although the Poco X3 Pro is an excellent phone for its price, my priorities are a superior display, high performance and top-notch camera capabilities. The AMOLED screen of the OnePlus 9 is much better for media consumption, and the Snapdragon 888 chip ensures smooth operation and gaming performance. The camera benefits of better sensors and features like 8K video, and RAW capture also makes the OnePlus a better overall option for my needs. While the battery is smaller, the fast charging and wireless charging features would mitigate this disadvantage. Overall, the OnePlus 9 aligns better with my needs for a premium, high-performance smartphone.

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.