Last Updated & Fact Checked: March 12, 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 GSM U.S. Version Phone w/ 12MP Camera - Midnight Black
- 6.2-inch Super AMOLED Capacitive Touchscreen, 1440 x 2960 pixel resolution with Scratch Resistant Display & Corning Gorilla Glass 5
- Android v7.0 Nougat, Chipset: Qualcomm MSM8998 Snapdragon 835, Processor: Octa-Core (Quad-Core 2.35 GHz Kryo & 1.9 GHz Kryo), GPU: Adreno 540
- Internal Memory: 64GB, 4GB RAM - microSD Up to 256GB
- 12 Megapixel Camera with f/1.7, 26mm, phase detection autofocus, OIS, LED flash + 8 Megapixel Front Camera with f/1.7, autofocus, 1440p@30fps
- WLAN: Wi-Fi 802.11 a/b/g/n/n(5GHz)/ac; Bluetooth: v5.0, A2DP, aptX; GPS: Yes with A-GPS, GLONASS, BDS; USB: 3.1, USB Type-C Reversible Connector
Bestseller No. 3
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.
New products & alternatives to the Samsung Galaxy S21 Ultra and the Samsung Galaxy S8 Plus
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 Silverblue
- 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 S21 FE 5G, Unlocked, 128GB, US Version (Lavender)
- Powerful Performance: Samsung's Octa-core processor and 6GB RAM deliver lightning-fast speeds for seamless multitasking and smooth app performance.
- Vibrant Display: Enjoy an immersive viewing experience with the 6.4-inch FHD+ Super AMOLED display, featuring a 120Hz refresh rate for smooth scrolling and gaming.
- Versatile Camera: Capture stunning photos and videos with the triple-lens rear camera system, including a 12MP main camera, 8MP telephoto, and 12MP ultra-wide lens.
- Long-Lasting Battery: The 4,500mAh battery with 25W Super Fast Charging ensures you can stay powered up throughout the day.
- Unlocked Freedom: This unlocked version is compatible with most major US carriers, giving you the flexibility to choose your preferred network.
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.
New
Samsung Galaxy S24+ Plus 5G, US Version, 256GB, Cobalt Violet - Verizon (Renewed)
- These devices will come in great cosmetic condition and include a box and charging cord (box may or may not be original). Will be good to work with the Verizon network only.
- Display Type: AMOLED; Operating System: Android 13.0
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!