Last Updated & Fact Checked: March 21, 2026
Are you trying to decide between the Samsung Galaxy S21 Ultra and the Samsung Galaxy S8 Plus?
Product Versus will provide you with all the product details so you can quickly compare the facts to find which product is right for you – the Samsung Galaxy S21 Ultra or the Samsung Galaxy S8 Plus – and find out exactly what the differences are.
Both the Samsung Galaxy S21 Ultra and the Samsung Galaxy S8 Plus are quality products, so read on to find out which one is best for your needs!
Samsung Galaxy S21 Ultra quick facts
Samsung Galaxy S8 Plus quick facts
Samsung Galaxy S21 Ultra product details
Bestseller No. 1
Samsung Galaxy S21 Ultra 5G, US Version, 128GB, Phantom Black - Unlocked (Renewed)
- The Samsung Galaxy S21 Ultra (Renewed) is a premium smartphone with a 6.8-inch AMOLED display, 120Hz refresh rate, and powerful camera system featuring a 108MP main lens and up to 100x zoom. It supports the S Pen, offers strong performance with 5G connectivity, and is ideal for users seeking flagship features at a better value.
Bestseller No. 2
Samsung Galaxy S21 Ultra 5G, US Version, 256GB, Phantom Black - Unlocked (Renewed)
- The Galaxy S21 Ultra features a massive 6.8-inch Dynamic AMOLED 2X display with Quad HD+ resolution, HDR10+ support, and an adaptive 120Hz refresh rate that scales dynamically to deliver ultra-smooth visuals while conserving battery life.
- Its rear camera system is a powerhouse, combining a 108MP wide sensor, 12MP ultra-wide lens, and two telephoto lenses (10MP each) with 3x and 10x optical zoom. With up to 100x Space Zoom, advanced AI scene optimization, and laser autofocus, the S21 Ultra captures extraordinary detail, whether shooting landscapes, zoomed-in subjects, or 8K video content.
- The phone is powered by Snapdragon 888 (U.S.) or Exynos 2100 (global) paired with up to 16GB of RAM, making it exceptionally fast for gaming, multitasking, and demanding productivity apps. Coupled with Samsung DeX support, the Ultra can be used like a full desktop workstation for editing, presentations, and professional workflows.
- The Galaxy S21 Ultra offers a 5,000 mAh intelligent adaptive battery with fast wired charging, fast wireless charging, and reverse wireless charging. Its AI-driven battery management optimizes power use based on your habits, allowing longer usage without frequent recharging—even with heavy multitasking or 5G connectivity.
- Security and connectivity are top-tier, featuring Samsung Knox Vault for advanced protection of sensitive data, ultrasonic in-display fingerprint scanning, facial recognition, and ultra-fast 5G and Wi-Fi 6E support. Enhanced stereo speakers with Dolby Atmos create immersive audio, making the device ideal for gaming, streaming, and professional multimedia experiences.
Bestseller No. 3
Samsung Electronics Samsung Galaxy S21 Ultra 5G | Factory Unlocked Android Cell Phone | US Version 5G Smartphone | Pro-Grade Camera, 108MP High Res | 128GB, Black (SM-G998UZKAXAA) (Renewed)
- Item Package Dimension- 6.9299999929314L X 5.6299999942574W X 1.3399999986332H Inches
- Item Package Weight - 0.78925489796 Pounds
- Item Package Quantity - 1
- Product Type - Cellular Phone
Samsung Galaxy S8 Plus product details
Bestseller No. 1
SAMSUNG Galaxy S8+ Plus | G955 | Factory Unlocked Smartphone | 4G LTE | 64 GB w/ 12MP Camera (Midnight Black) (Renewed)
- Tested for battery health and guaranteed to have a minimum battery capacity of 80%.
- Successfully passed a full diagnostic test which ensures like-new functionality and removal of any prior-user personal information.
- Inspected and guaranteed to have minimal cosmetic damage, which is not noticeable when the device is held at arm's length.
- The device does not come with headphones or a SIM card. It does include a charger and charging cable that may be generic.
- Fully Unlocked: Fully unlocked and compatible with any carrier of choice (e.g. AT&T, T-Mobile, Sprint, Verizon, US-Cellular, Cricket, Metro, etc.), both domestically and internationally.
Bestseller No. 2
Samsung Galaxy S8+ G955U 64GB Unlocked w/ 12MP Camera - Orchid Gray(Renewed)
- Tested for battery health and guaranteed to have a minimum battery capacity of 80%.
- Successfully passed a full diagnostic test which ensures like-new functionality and removal of any prior-user personal information.
- Inspected and guaranteed to have minimal cosmetic damage, which is not noticeable when the device is held at arm's length.
- The device does not come with headphones or a SIM card. It does include a charger and charging cable that may be generic.
- Fully Unlocked: Fully unlocked and compatible with any carrier of choice (e.g. AT&T, T-Mobile, Sprint, Verizon, US-Cellular, Cricket, Metro, etc.), both domestically and internationally.
Bestseller No. 3
Samsung Galaxy S20+ 5G, 128GB, Cosmic Black - Fully Unlocked (Renewed), S20+ Plus 5G
- The Samsung Galaxy S20+ has a large 6.7-inch Dynamic AMOLED 2X display with HDR10+ support, delivering rich contrast and true-to-life colors, perfect for immersive media consumption.
- Its camera setup includes a 64MP telephoto lens with 3x hybrid zoom and up to 30x Super Resolution Zoom, along with a DepthVision sensor that enhances portrait mode and enables advanced AR effects.
- The phone supports 5G connectivity, Wi-Fi 6, and ultra-low latency networking, making it ideal for cloud gaming, streaming, and fast file transfers.
- It features stereo speakers tuned by AKG and Dolby Atmos support, providing a cinematic audio experience without headphones.
- The Galaxy S20+ also has an ultrasonic in-display fingerprint sensor, IP68 water and dust resistance, and Samsung DeX support, allowing you to connect the phone to a monitor for a desktop-like productivity setup.
New products & alternatives to the Samsung Galaxy S21 Ultra and the Samsung Galaxy S8 Plus
New
Samsung Galaxy S21 FE 5G, US Version, 128GB, Olive Green - Boost (Renewed)
- 6.4" FHD+ Dynamic AMOLED 2X, Infinity-O Display (2400x1080), 401ppi, HDR10+ certified, 120Hz refresh rate
- 128GB ROM, 6GB RAM, Qualcomm SM8350 Snapdragon 888 5G (5 nm), Octa-core, 4500mAh Battery
- Rear Camera: 12MP Ultra-Wide + 12MP Wide-angle + 8MP Telephoto, Front Camera: 32MP, Under Display Fingerprint
- 2G: GSM 850/900/1800/1900, CDMA 800/1900 / TD-SCDMA, 3G: HSDPA 850/900/1700(AWS)/1900/2100, CDMA2000 1xEV-DO, 4G: LTE 1/2/3/4/5/7/12/13/29/25/26/28/38/39/40/41/46/48/66/71, 5G: 41/66/71/260/261 SA/NSA/Sub6 (ensure to check compatibility with your carrier before purchase)
- This device is only compatible with the Boost Mobile network.
New
Samsung Galaxy S21 FE 5G, US Version, 128GB, White - AT&T (Renewed)
- SMOOTH SCROLLING: The 120Hz display delivers a super smooth scroll, with optimized refresh rate, and a fast touch response gives seamless visuals in both work and play
- REAL DISPLAY VISION: The high quality display with Dynamic AMOLED 2X delivers vibrant color and brightness, even in bright sunlight
- PRO-GRADE CAMERA: The powerful pro grade camera delivers high quality photos and videos, with a Rear Camera that boasts 12MP Ultra Wide, Wide-angle cameras and an 8MP Telephoto Camera; It also features a Front Camera that includes a 32MP Selfie Camera
- 30X SPACE ZOOM: 30x SpaceZoom combines a 3x Hybrid Optic Zoom and 30x digital zoom for high resolution close ups, while the EngageZoom Lock reduces shakiness the further your zoom in
- SUPERIOR PERFORMANCE: The power-efficient processor chip offers reliability and performance that boosts every experience, from graphic-heavy gaming to multitasking.
New
Samsung Galaxy S25 Ultra, 512GB Smartphone, Unlocked Android, AI Night Mode Camera, Snapdragon 8 Elite Fast Processor, 5000mAh Battery, Built-in S Pen, 2025, US 1 Yr Warranty, Titanium Black
- MULTIPLE TASKS WITH ONE ASK: Streamline your day with an assistant that gets you. Ask it to Google search for a pet-friendly vegan restaurant nearby and text it to your friend— your Galaxy S25 Ultra handles multiple tasks with a single ask.¹
- START THE DAY SMARTER: Stay one step ahead with a phone that gives you the info you need before you even know you need it with Now Brief.²
- REDUCE THE NOISE. REVEAL THE MAGIC: AI Camera with Audio Eraser lets you capture vibrant videos in low light and minimize unwanted noises so you can relive your favorite moments with fewer distractions.³
- BRING OUT THE BEST IN EVERY FACE: Capture every portrait with clarity and confidence on the Galaxy S25 Ultra. The advanced portrait features adjust skin tones and preserve natural textures, giving every shot a polished, professional look.
- SWITCHING IS QUICK & EASY: With Smart Switch, you can move your pics, videos, music, apps, contacts and convos to their new home, safely and securely, in just a few simple steps.
New
Samsung Galaxy S24 FE AI Phone, 128GB Unlocked Android Smartphone, High-Res 50MP Camera, Long Battery Life, AMOLED Bright Display, US Version, 2024, US 1 Yr Warranty, Gray
- MOVE IT. REMOVE IT. IMPROVE IT: Take a great pic, then make it better using Photo Assist¹ with Galaxy AI,² It gives you suggestions for improving your photo and makes it easier to move, remove or resize objects for post-worthy pics every time.
- NEVER BE LOST IN TRANSLATION AGAIN: Understand text, calls and in-person conversations in another language using real-time translations¹ with Galaxy AI.²
- SLOW-MO MADE SIMPLE: Sometimes you just want to make the moment last longer. Using Instant Slow-Mo¹ with Galaxy AI,² simply tap and hold to replay any video in epic slow motion.
- DO MORE W/ EPIC BATTERY POWER: Do what you love, whether work or play, without worrying about your battery. Galaxy S24 FE intuitively manages your apps to make your charge last longer.⁴.
- CAPTURE HIGHLIGHTS IN LOW LIGHT: Poorly lit portraits? Not anymore. Bring details out of the dark with Night Portrait. Using AI,² your Galaxy S24 FE can analyze and optimize your low-light shots and make them shine.
Our conclusion on the Samsung Galaxy S21 Ultra vs Samsung Galaxy S8 Plus
Both the Samsung Galaxy S21 Ultra and the Samsung Galaxy S8 Plus are high quality products and we are sure you will be happy with either one. In the end it comes down to your budget and the value for money you are looking for.
Either way, the Samsung Galaxy S21 Ultra and the Samsung Galaxy S8 Plus are both excellent products that will more than do their job!