Galaxy S21 Ultra 5G Vs Google Pixel 9 Pro

When considering the practical lifespan of these devices, their release timelines and software support policies are key factors.

• Release Timeline: The Galaxy S21 Ultra 5G was introduced in January 2021, making it an earlier generation device. The Google Pixel 9 Pro, on the other hand, was released in August and September 2024, positioning it as a much newer model.
• Software Longevity: The Galaxy S21 Ultra 5G received its final major Android operating system update, Android 15, in May 2025, with security updates concluding around February 2026. In contrast, the Google Pixel 9 Pro launched with Android 15 and is committed to receiving seven years of major OS updates, extending its software support significantly further into the future.
• Practical Lifespan: Users prioritizing long-term software updates and access to the latest Android features will find the Pixel 9 Pro offers a considerably longer period of official support. For those considering an eco-friendly, quality-assured refurbished option, understanding these support timelines helps in making an informed choice about how long a device will remain current.

Performance is a critical aspect for daily smartphone use, encompassing everything from app responsiveness to handling demanding tasks.

• Processing Power: The Google Pixel 9 Pro features a more recent generation processor, which translates to faster app loading times, smoother transitions between applications, and more efficient handling of complex tasks like advanced photo editing or graphically intensive games. The Galaxy S21 Ultra 5G, while powerful at its release, utilizes an earlier generation processor, which may show its age with the most demanding modern applications.
• Multitasking and Responsiveness: The Pixel 9 Pro typically comes with 16GB of RAM, contributing to its ability to manage numerous applications simultaneously without slowdowns. The Galaxy S21 Ultra 5G was available with 12GB or 16GB of RAM, offering strong multitasking capabilities for its generation. Both devices provide a responsive user experience for everyday tasks, but the Pixel 9 Pro offers more headroom for future software and application demands.
• Battery Behavior: The Galaxy S21 Ultra 5G is equipped with a 5000 mAh battery, providing ample power for a full day of typical use. The Pixel 9 Pro has a slightly smaller 4700 mAh battery, but its newer, more efficient processor and software optimizations contribute to excellent battery endurance, often lasting through extended periods of heavy use.

The display is the primary interface for smartphone interaction, and both devices offer high-quality viewing experiences with distinct characteristics.

• Display Technology and Clarity: The Galaxy S21 Ultra 5G features a 6.8-inch Dynamic AMOLED 2X display with a resolution of 3200 x 1440 pixels, delivering sharp images and vibrant colors. The Google Pixel 9 Pro has a slightly smaller 6.3-inch LTPO OLED display with a resolution of 2856 x 1280 pixels, also offering excellent clarity and color reproduction.
• Brightness and Refresh Rate: The Pixel 9 Pro boasts a significantly higher peak brightness of up to 3000 nits, making it exceptionally visible in bright outdoor conditions. The S21 Ultra 5G offers a peak brightness of 1500 nits, which is still bright for most environments. Both phones feature adaptive refresh rates up to 120Hz, providing smooth scrolling and fluid animations, with the Pixel 9 Pro capable of scaling down to 1Hz for improved power efficiency.
• Viewing Experience: Users who prefer a larger screen for media consumption or productivity might lean towards the S21 Ultra 5G's 6.8-inch display. Those who favor a more compact device with cutting-edge brightness and adaptive refresh rate technology will appreciate the Pixel 9 Pro's screen.

Both smartphones are equipped with advanced camera systems designed to capture high-quality photos and videos, though they approach imaging with different strengths.

• Rear Camera Systems: The Galaxy S21 Ultra 5G features a versatile quad-camera setup, including a 108 MP main sensor, a 12 MP ultrawide, and two 10 MP telephoto lenses offering 3x and 10x optical zoom. The Pixel 9 Pro comes with a triple-camera system, comprising a 50 MP main sensor, a 48 MP ultrawide with macro capabilities, and a 48 MP telephoto lens with 5x optical zoom.
• Photography Performance: The S21 Ultra 5G excels with its dual telephoto lenses, providing exceptional zoom flexibility, including a 10x optical zoom for distant subjects. The Pixel 9 Pro leverages its newer sensors and advanced computational photography, including features like Super Res Zoom, to deliver detailed images across its lenses, with a strong emphasis on natural colors and low-light performance.
• Video Recording and Front Camera: Both devices support 4K video recording at 60 frames per second across all their cameras, with the S21 Ultra 5G also offering 8K at 30fps. The Pixel 9 Pro can achieve 8K video through cloud-based Video Boost processing. For selfies, the S21 Ultra 5G has a 40 MP front camera, while the Pixel 9 Pro features a 42 MP front camera with autofocus.

Beyond core features, several practical elements contribute to the overall user experience and device utility.

• Connectivity and Ports: Both smartphones support 5G connectivity for fast mobile data. The Galaxy S21 Ultra 5G features Wi-Fi 6E and Bluetooth 5.2. The Pixel 9 Pro, being newer, supports Wi-Fi 7 and Bluetooth 5.4, offering more advanced wireless capabilities. Both utilize a USB-C port for charging and data transfer.
• Biometric Security and Build: For security, the S21 Ultra 5G uses an ultrasonic under-display fingerprint sensor, while the Pixel 9 Pro also incorporates an under-display fingerprint sensor. Both devices boast an IP68 rating for dust and water resistance, indicating robust build quality.
• Design and Handling: The Galaxy S21 Ultra 5G measures 165.1 x 75.6 x 8.9 mm and weighs 228g, offering a substantial feel. The Pixel 9 Pro is more compact and lighter at 72 x 152.8 x 8.5 mm and 199g, which may appeal to users preferring a smaller device for one-handed use. The S21 Ultra 5G also uniquely supports the S Pen, though it is sold separately.