Galaxy S21 Ultra 5G • Unlocked vs Google Pixel 9 Pro XL • Unlocked

The Samsung Galaxy S21 Ultra 5G, released in January 2021, and the Google Pixel 9 Pro XL, launched in August 2024, represent flagship smartphones from their respective manufacturers. While both devices offer premium experiences, the Pixel 9 Pro XL introduces advancements in software longevity, processing capabilities, and camera technology due to its more recent release. Both operate on the Android platform, but with distinct approaches to software and user interface.

The practical lifespan of a smartphone is influenced by its initial release, ongoing software support, and ease of repair. These factors determine how long a device remains functional and secure for daily use.

• Release Timeline: The Galaxy S21 Ultra 5G was released in January 2021, making it an older device compared to the Google Pixel 9 Pro XL, which launched in August 2024. This three-and-a-half-year difference significantly impacts their remaining support cycles.
• Software Longevity: The Galaxy S21 Ultra 5G received four major Android OS updates, concluding with Android 15 (One UI 7) in early 2025, and security updates were expected to continue until the first quarter of 2026. [28, 35, 42] In contrast, the Google Pixel 9 Pro XL launched with Android 15 and is promised seven years of OS updates, extending its software support significantly further into the future. [2, 3, 4, 9]
• Repairability: The Galaxy S21 Ultra 5G generally received low repairability scores, often around 3/10 or 6/10, due to extensive use of adhesive for the battery, display, and back panel, making disassembly challenging. [26, 29, 30, 31, 33] The Pixel 9 Pro XL, however, shows efforts towards improved repairability with a dual-entry design that allows for independent removal of the front screen or back panel, and easier replacement of components like the USB-C port. [43] Despite these improvements, some reports still note challenges with screen fragility and battery removal. [16, 22, 43]

Performance in modern smartphones is about more than just raw speed; it encompasses how smoothly applications run, how efficiently the device handles multitasking, and its overall responsiveness to user input. Both devices offer robust performance for their respective generations.

• Processing Power: The Galaxy S21 Ultra 5G is powered by a high-end processor from its release year, enabling smooth operation for most applications and demanding tasks. [6, 19, 25] The Google Pixel 9 Pro XL features a newer-generation processor designed for enhanced AI processing and overall system efficiency, providing a noticeable boost in responsiveness and handling of complex computational tasks. [2, 3, 4, 9, 14, 45]
• Multitasking and Storage: The Galaxy S21 Ultra 5G offers configurations with 12GB or 16GB of RAM, providing ample capacity for running multiple applications simultaneously without significant slowdowns. [18, 19, 25, 36] The Pixel 9 Pro XL comes with 16GB of RAM as standard, further enhancing its ability to manage numerous demanding applications and large files efficiently. [3, 4, 9, 14, 45] Both devices offer various internal storage options, but neither supports expandable storage via microSD cards. [25, 7]
• Battery Behavior: The Galaxy S21 Ultra 5G features a 5000mAh battery, capable of providing a full day of moderate to heavy use, with some users reporting around 10-11 hours of screen-on time. [6, 18, 15, 32] The Pixel 9 Pro XL is equipped with a 5060mAh battery, and user reports indicate it can last for approximately 49 hours of total usage, translating to over two days for many users. [2, 3, 4, 7, 8, 9, 11, 38, 45] Both support fast wired and wireless charging. [6, 18, 19, 25, 2, 3, 4, 7, 8, 9, 11, 38, 45]

The display is a primary interface for smartphone interaction, and its quality significantly impacts the user experience, from viewing content to navigating applications. Both the Galaxy S21 Ultra 5G and Pixel 9 Pro XL feature high-quality displays with distinct characteristics.

• Display Technology and Resolution: The Galaxy S21 Ultra 5G features a 6.8-inch Dynamic AMOLED 2X display with a resolution of 3200x1440 pixels, offering sharp details and vibrant colors. [6, 18, 24, 25, 27] The Pixel 9 Pro XL comes with a 6.7-inch QHD+ LTPO OLED display, providing a resolution of 2992x1344 pixels, which also delivers excellent clarity and color accuracy. [2, 4, 7, 8, 9, 23, 45]
• Brightness and Refresh Rate: The Galaxy S21 Ultra 5G's display can reach a peak brightness of 1500 nits, ensuring good visibility in various lighting conditions. [6] It also features an adaptive refresh rate ranging from 10Hz to 120Hz for smooth scrolling and power efficiency. [6, 18, 25] The Pixel 9 Pro XL boasts a higher peak brightness of 3000 nits, offering superior outdoor visibility. [2, 4, 7, 8, 9, 23, 45] Its LTPO OLED panel also supports an adaptive refresh rate from 1Hz to 120Hz, optimizing power consumption based on content. [7]
• Viewing Experience: Both devices provide an immersive viewing experience with their large, high-resolution OLED panels. The Galaxy S21 Ultra 5G's slightly larger screen offers a expansive canvas, while the Pixel 9 Pro XL's higher peak brightness makes it particularly well-suited for bright outdoor environments.

Camera systems are a crucial aspect of modern smartphones, with both hardware and software playing significant roles in image and video quality. The Galaxy S21 Ultra 5G and Pixel 9 Pro XL offer advanced photographic capabilities tailored to different user preferences.

• Rear Camera Systems: The Galaxy S21 Ultra 5G features a versatile quad-camera setup, including a 108MP main sensor, a 12MP ultrawide lens, a 10MP telephoto lens with 3x optical zoom, and a 10MP periscope telephoto lens with 10x optical zoom. [6, 18, 20, 24, 25] This configuration provides extensive zoom capabilities. The Pixel 9 Pro XL sports a triple-lens rear camera system, comprising a 50MP main sensor, a 48MP ultrawide lens, and a 48MP telephoto lens with 5x optical zoom. [3, 5, 7, 8, 9, 14, 45]
• Photography Features and Performance: The Galaxy S21 Ultra 5G is known for its detailed images and strong zoom performance, with users praising its ability to capture distant subjects clearly. [6] The Pixel 9 Pro XL leverages Google's computational photography, offering features like enhanced Night Sight, Super Res Zoom, and AI-powered tools such as 'Add Me' and 'Magic Editor' for creative photo manipulation. [12, 17, 40, 41] Its main camera is designed for improved low-light performance. [5]
• Video Recording and Front Camera: Both devices are capable of high-quality video recording. The Galaxy S21 Ultra 5G supports 8K video at 24 frames per second and 4K at 30 or 60 frames per second, with a 40MP front camera. [6, 18, 20, 24, 25] The Pixel 9 Pro XL also offers 8K video recording, but at 30 frames per second, and 4K at 30 or 60 frames per second, featuring a 42MP front camera with autofocus for sharper selfies. [3, 5, 7, 8, 9, 12, 14, 17, 40, 41, 45] The Pixel also includes 'Video Boost' for enhanced video quality. [12, 17, 40, 41]