1. Specifications Comparison
Design
| Feature | Samsung Galaxy S21 Ultra 5G | Google Pixel 9 | Practical Impact |
|---|---|---|---|
| Dimensions | 165.1 × 75.6 × 8.9 mm | 152.8 × 72 × 8.5 mm | S21 Ultra is larger and bulkier, potentially less comfortable for small hands or pockets. |
| Weight | 227g | 198g | Pixel 9 is noticeably lighter, making it more comfortable for extended use and easier to carry. |
| Build | Standard | Standard | Both are standard non-folding smartphones. |
Display
| Feature | Samsung Galaxy S21 Ultra 5G | Google Pixel 9 | Practical Impact |
|---|---|---|---|
| Size | 6.8" | 6.3" | S21 Ultra has a larger screen, better for media consumption and multitasking, while Pixel 9 is more compact. |
| Resolution | 1440x3200 | 1080x2424 | S21 Ultra has a significantly sharper display with higher detail, noticeable when viewing images and videos, Pixel 9 might have better battery performance due to lower resolution. |
| PPI | 515 | 422 | S21 Ultra offers noticeably sharper text and images due to higher pixel density, leading to a more detailed visual experience. |
| Technology | AMOLED | OLED | Both technologies offer excellent contrast and vibrant colors, with minor differences in color calibration and brightness. |
| Refresh Rate | 120Hz | 120Hz | Both provide smooth scrolling and animations for a fluid user experience. |
| Brightness | 1500 nits | 0 nits | S21 Ultra offers dramatically better outdoor visibility, the Pixel 9's brightness is unknown and could be problematic under direct sunlight. |
Performance
| Feature | Samsung Galaxy S21 Ultra 5G | Google Pixel 9 | Practical Impact |
|---|---|---|---|
| Chipset | Exynos 2100 (5 nm) - International | Google Tensor G4 (4 nm) | Tensor G4 offers newer architecture potentially better performance, efficiency. |
| AnTuTu Score | 749,000 | 1,071,616 | Pixel 9 demonstrates better overall performance for gaming, multitasking, and daily use with much higher benchmark scores. |
| GPU | Mali-G78 MP14 - International | Mali-G715 MC7 | Pixel 9 has a newer architecture GPU, which could potentially offer better performance and efficiency. |
Camera
| Feature | Samsung Galaxy S21 Ultra 5G | Google Pixel 9 | Practical Impact |
|---|---|---|---|
| Standard Camera | 108MP f/1.8 1/1.33" | 50MP f/1.69 1/1.3" | S21 Ultra has higher resolution; Pixel 9 has wider aperture and slightly larger sensor size, suggesting potentially better low-light performance and more light gathering for each pixel. |
| Telephoto + Portrait | 10.8MP f/2.4 1/2.65" | N/A | S21 Ultra offers dedicated telephoto capabilities for portrait shots, while the Pixel 9 lacks this. |
| Selfie Camera | 44MP f/2.2 1/2.65" | 10.5MP f/2.2 | S21 Ultra provides higher resolution selfies for detailed images, although the Pixel 9's image processing could still deliver great results. |
| Telephoto Lens | 10.8MP f/4.9 1/2.65" | N/A | S21 Ultra offers dedicated zoom capabilities at higher zoom levels, which the Pixel 9 lacks. |
| Wide Angle + Macro | 12.2MP f/2.2 1/2.55" | 48MP f/1.7 | Pixel 9 has a higher resolution and wider aperture, indicating better image quality and better low light performance in wide angle shots, particularly for landscape or group photos. |
| Video | Up to 8K@24fps, various 4K and 1080p options | Up to 4K@60fps, various 1080p options | S21 Ultra offers higher resolution video recording, potentially better for videographers and professional users, Pixel 9 offers more stable footage. |
| DxoMark Mobile Score | 115 | 154 | Pixel 9 has a much higher DXoMark score indicating much better camera performance overall compared to the S21 Ultra. |
| DxoMark Selfie Score | 135 | N/A | Samsung S21 Ultra scores 135, but the Pixel 9 hasn't been tested for its selfie camera performance. |
| Camera Features | 8K, Optical zoom, Quadruple camera, Laser AF, RAW, etc. | Flicker sensor, Pro Video Mode, Dual camera, NPU AI Engine, etc. | S21 Ultra has dedicated optical zoom and laser AF, while Pixel 9 has an NPU AI engine for enhanced image processing and software based features. |
Battery
| Feature | Samsung Galaxy S21 Ultra 5G | Google Pixel 9 | Practical Impact |
|---|---|---|---|
| Capacity | 5000mAh | 4700mAh | S21 Ultra has a slightly larger battery which could potentially mean better overall battery life. |
| Charging | 25W Fast Charging | 27W Fast Charging | Pixel 9 has marginally faster charging capabilities. |
| Features | Reverse charging, 15W Wireless, 9W Reverse Wireless | Reverse charging, 15W Wireless | S21 Ultra offers reverse wireless charging, which is helpful for charging other devices wirelessly on the go, while the Pixel 9 does not. |
Other
| Feature | Samsung Galaxy S21 Ultra 5G | Google Pixel 9 | Practical Impact |
|---|---|---|---|
| Operating System | Android 11 (upgradable to 15) | Android 14 (upgradable to 21) | Pixel 9 has a newer OS with more extended support for future updates, and latest features and security updates compared to the S21 Ultra. |
| WiFi | WiFi 6 | WiFi 6 | Both offer similar Wi-Fi connectivity standards for fast wireless data transfers. |
| Bluetooth | Bluetooth 5.2 | Bluetooth 5.3 | Pixel 9 features a newer version of bluetooth, which could potentially offer better energy efficiency and stability compared to the S21 Ultra. |
| GPS | GPS (L1+L5), Galileo (E1+E5a) | GPS, GLONASS (L1), NavIC System, GNSS | Pixel 9 has better location accuracy due to a wider range of satellite systems compared to the S21 Ultra. |
| SIM | Dual SIM (Nano SIM + Nano SIM) | Dual SIM (Nano SIM + eSIM) | Pixel 9 supports eSIM, offering a more flexible approach to carrier management while the S21 Ultra supports two physical SIM cards, if eSIM functionality is not a priority for the user. |
| Internal Storage | 128GB, 256GB, 512GB | 128GB, 256GB | S21 Ultra provides an option for higher storage space, while both offer similar smaller storage options. |
| RAM | 12GB or 16GB | 12GB | S21 Ultra with 16GB option is better for heavy multitasking and memory-intensive operations. |
| Expandable Storage | No | No | Neither phone supports expandable storage, meaning users are limited to the internal memory they choose when purchasing the device. |
| Audio | Dolby Atmos, Hi-Res Audio | 3 Microphones | S21 Ultra supports spatial audio enhancement while the Pixel 9 offers an extra microphone for better audio quality in calls and recordings. |
| Security | Basic Fingerprint | Basic Fingerprint | Both phones offer basic fingerprint sensor technology for security. |
| Screen Protection | Corning Gorilla Glass Victus | Corning Gorilla Glass Victus 2 | Pixel 9 has the newer screen protection offering slightly better drop and scratch resistance compared to the S21 Ultra. |
| Sensors | Compass, Hall, Geomagnetic | None | S21 Ultra has a wider range of sensors, which could be useful for specific applications such as mapping and gaming compared to the Pixel 9. |
2. Key Differences Analysis
Samsung Galaxy S21 Ultra 5G Advantages:
- Larger and Sharper Display: 6.8" 1440p AMOLED screen with higher PPI for a more immersive and detailed visual experience.
- Higher Video Resolution: 8K video recording for professional-grade video content creation.
- Versatile Camera System: Dedicated telephoto and portrait lenses for better optical zoom capabilities.
- Reverse Wireless Charging: Can charge other devices wirelessly, which could be very convenient on the go.
- Higher RAM Option: 16GB RAM option for heavy multitasking and intensive applications.
- 512GB Storage Option: More storage for users who need the largest possible capacity.
Google Pixel 9 Advantages:
- Newer Chipset & Higher Performance: Google Tensor G4 offers improved performance in benchmarks and likely better AI processing capabilities.
- Superior Camera Quality: Better DXoMark scores suggest significantly better photo and video quality due to superior image processing.
- Lighter and More Compact Design: Easier to handle and carry, especially for users with smaller hands or pockets.
- Newer Software: Android 14 with extended support for future upgrades and security patches.
- Better Connectivity: Newer Bluetooth 5.3 and more satellite systems for location tracking.
- Faster Charging: Slightly faster wired charging compared to the S21 Ultra, and more efficient charging algorithm, although real-world differences might be marginal.
- eSIM support: Flexible carrier management options with eSIM functionality.
- Better Wide Angle Lens: Higher resolution and wider aperture, leading to better quality wide angle images.
Significant Trade-offs:
S21 Ultra:
- Larger size and heavier, potentially less ergonomic for some users.
- Older chipset and OS, likely to receive less software support in the future.
- Lower DxOMark score indicating weaker camera performance compared to the Pixel 9.
- Does not have the latest Bluetooth version compared to Pixel 9.
Pixel 9:
- Smaller display with lower resolution and pixel density, which might be a concern for users who prioritize large screens and high detail.
- Lacks dedicated telephoto zoom lens, limiting optical zoom range.
- Does not have reverse wireless charging.
- Lacks the 512 GB storage option, which might be a concern for users who require large internal storage.
- Unknown display brightness, could be problematic for outdoor use.
3. User Profiles & Recommendations
Ideal Users for Samsung Galaxy S21 Ultra 5G:
- Power Users: Those who prioritize large, high-resolution displays for media consumption, multitasking, or creative work.
- Photography Enthusiasts: Users who value optical zoom capabilities and higher video recording resolutions.
- Users who frequently need to charge other devices wirelessly.
- Users who need the maximum internal storage of 512 GB.
- Users who prefer having two physical SIM cards and do not need the eSIM option.
- Gamers: Those who will benefit from the expanded sensor suite.
Use Cases:
- Watching movies and videos on a large, sharp display.
- Capturing detailed photos and videos with optical zoom options.
- Using the phone as a portable workstation with split-screen multitasking.
- Charging wireless earbuds or other devices on the go.
- Playing games that require multiple sensors.
Ideal Users for Google Pixel 9:
- General Users: Those who value a balanced phone with a focus on a great camera experience and the latest software.
- Photography enthusiasts: Those who value image quality with intelligent software features rather than optical zoom.
- Users who prioritize a compact and lightweight design.
- Users who want the newest software and the best security updates.
- Users who prefer the flexibility of eSIM functionality.
Use Cases:
- Capturing high-quality photos and videos using AI-enhanced features.
- Daily usage with a preference for smooth performance and the latest Android updates.
- Carrying a lightweight and pocketable smartphone.
- Users who need good location accuracy for navigation and mapping applications.
- Users who prioritize better wide angle lens performance.
Price-to-Value Ratio:
- The Samsung Galaxy S21 Ultra 5G, being an older model, will likely be more affordable. This makes it a good value for users who want premium features without the premium price tag.
- The Google Pixel 9 will likely be priced higher, but it offers more modern technology, a newer OS, and a superior camera, making it a better value for users who prioritize those aspects.
4. Decision Framework
Key Questions for Buyers:
- What display size do you prefer and do you need the sharpest resolution possible? Larger immersive screen (S21 Ultra) or compact and pocketable (Pixel 9).
- How important is camera quality and flexibility? Versatile optical zoom (S21 Ultra) vs. superior image processing (Pixel 9).
- Do you prioritize the latest software and security updates and performance or are you ok with something older? Newer OS and performance with more updates (Pixel 9) vs. older OS with less updates but lower cost (S21 Ultra).
Scenario-Based Recommendations:
- Scenario 1: Professional Photographer/Videographer: If you need high resolution video recording with versatile zoom capabilities and you do not care about software updates or portability, the Samsung Galaxy S21 Ultra 5G is preferable.
- Scenario 2: Casual User with a focus on camera and software: If you want a user-friendly phone with a great camera, good performance, and the latest software, the Google Pixel 9 is preferable, especially if you value a compact design and portability.
- Scenario 3: Price-conscious buyer: If you want a premium phone experience without paying a premium price, the Samsung Galaxy S21 Ultra 5G offers a good balance of features and price. But keep in mind the older software.
My Choice
If I were choosing between these two phones, I would choose the Google Pixel 9. Here's why:
While the Samsung S21 Ultra 5G boasts a larger screen and some specialized camera features like telephoto lenses and 8K video, the Pixel 9 provides a much better overall user experience. The Pixel 9's significantly improved camera, faster processing power, more recent software, and more compact design make it a better everyday device. The DxOMark score clearly shows the superior image quality of the Pixel 9, which is a big factor for me. Furthermore, the promise of extended software updates and better connectivity with newer standards is a key consideration for future-proofing. The lack of reverse wireless charging and 512GB option on the Pixel 9 are less important to me than a superior core experience. The S21 Ultra is still a good phone, but the Pixel 9 is the more compelling choice overall if I were buying today, especially because the brightness of the pixel is unknown and could be problematic.
