Last Updated & Fact Checked: March 21, 2026
Are you trying to decide between the OnePlus 9 Pro and the Samsung Galaxy S21 Ultra?
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 OnePlus 9 Pro or the Samsung Galaxy S21 Ultra – and find out exactly what the differences are.
Both the OnePlus 9 Pro and the Samsung Galaxy S21 Ultra are quality products, so read on to find out which one is best for your needs!
OnePlus 9 Pro quick facts
Samsung Galaxy S21 Ultra quick facts
OnePlus 9 Pro product details
Bestseller No. 1
OnePlus 9 Pro, 5G Android Smartphone U.S Version,12GB RAM+256GB Storage,120Hz Fluid Display,Hasselblad Quad Camera, Fully Unlocked (Morning Mist) (Renewed)
- Product Type -Cellular Phone
- Package Quantity-1
- Package Dimension-9.2099999906058 inchesL X 3.8599999960628 inchesW X 3.1099999968278 inchesH
- Package Weight -1.62921611618 Lbs
Bestseller No. 2
OnePlus 9 Pro, 5G Android Smartphone U.S Version,12GB RAM+256GB Storage,120Hz Fluid Display,Hasselblad Quad Camera, Fully Unlocked (Pine Green) (Renewed)
- Network Support: Unlocked
- Storage Capacity: 256 GB
- Color: Green
- Cosmetic Condition: Grade A
- Screen Size: 6.7 in.
Bestseller No. 3
ONEPLUS 9 | 5G Android Smartphone U.S Version | 8GB RAM+128GB Storage | 120Hz Fluid Display | T-Mobile Winter Mist (Renewed)
- CONDITION: The phone is renewed condition which means it is pre owned. Might have sligh signs of usage but fully adhere with amazon renewed phone grading. Comes in a generic box with charger and sim pin tool. No other accessories are inlcuded
- CARRIER: The phone is locked to T-Mobile carrier so will only work with T-Mobile sim card
- CAMERA: Has an amazing Hasselblad Camera for Mobile - Rear Camera: 48MP, f/1.8 + 50MP, f/2.2 + 2MP, f/2.4, Front Camera: 16MP, f/2.4
- DISPLAY: 6.55" 120Hz Fluid AMOLED, 2400 x 1080 pixels 402 ppi, 4500mAh Battery, Bluetooth 5.2, In-display Fingerprint Sensor
- Manufacturer : OnePlus
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
New products & alternatives to the OnePlus 9 Pro and the Samsung Galaxy S21 Ultra
New
OnePlus 15R, 12GB RAM + 512GB Storage, Dual-SIM, Unlocked Android Smartphone, Snapdragon 8 Gen 5, 7400mAh Battery, Charcoal Black
- World's First Snapdragon 8 Gen 5: Powered by the Snapdragon 8 Gen 5, plus a custom Wi-Fi chip and dedicated Touch Response chip, you get lightning-fast speeds, stable connections, and ultra-responsive touch control.
- Impossibly Smooth 165Hz Display: Experience extreme smoothness on a 165Hz, 1.5K flagship display powered by our 3200Hz Touch Response Chip for lightning-fast interactions.
- Our largest-ever 7,400mAh battery:Power up your day with 80W SUPERVOOC charging for power that last all day and beyond.
- Industry's Most Complete IP Ratings:Backed by the industry's most complete IP ratings, the OnePlus 15R doesn't even blink at dust storms, and shrugs off powerful water blasts.
- OxygenOS 16 delivers a faster, smoother, and more intuitive experience, with refined design, smarter features, and enhanced performance that keeps up with your day.
New
OnePlus 9 Pro Dual-SIM 128GB ROM + 12GB RAM (GSM Only | No CDMA) Factory Unlocked 5G Android Smartphone (Stellar Black) - International Version
- For USA Buyers: This Smartphone is not compatible/will not work with any CDMA Networks including: VERIZON, SPRINT, US CELLULAR. Please check with your network provider for 3G or 4G/LTE compatibility check before you purchase.
- SIM CARD 1 & 2: 2G : GSM 850 / 900 / 1800 / 1900 and/or 3G : WCDMA 800(B19) / 850(B5) / 900(B8) / 1700(B9) / 1700|2100(B4) / 1900(B2) / 2100(B1) and/or LTE-FDD B700(B12) / 700(B13) / 700(B17) / 700(B28) / 800(B20) / 850(B5) / 850(B18) / 850(B19) / 850(B26) / 900(B8) / 1500(B32) / 1700|2100(B4) / 1800(B3) / 1900(B2) / 1900(B25) / 2100(B1) / 2100(B66) / 2600(B7) : LTE-TDD B2600(B38) / 1900(B39) / 2300(B40) / 2500(B41) and/or 5G : NSA N1/3/5/7/8/20/28/38/40/41/66/77/78: SA N1/3/7/28/41/78]
- 6.7 inches, LTPO Fluid2 AMOLED, 1B colors, 1440 x 3216 pixels, Corning Gorilla Glass 5
- 128GB Storage, 12GB RAM
- Android 11, OxygenOS 11, Qualcomm SM8350 Snapdragon 888 (5 nm), Octa-core (1x2.84 GHz Kryo 680 & 3x2.42 GHz Kryo 680 & 4x1.80 GHz Kryo 680
New
OnePlus 15, 16GB RAM + 512GB Storage, Dual-SIM, Unlocked Android Smartphone, Snapdragon 8 Elite Gen 5, 7300mAh Battery, Infinite Black
- Massive 7,300 mAh Battery – Go longer between charges with power that lasts all day and beyond.
- Tri-Chip System – Combines the Snapdragon 8 Elite Gen 5 with our dedicated Wi-Fi chip, and CPU scheduler for faster performance, smoother connectivity, and superior efficiency.
- Triple 50 MP Camera System – Capture every detail with wide, ultra-wide, and telephoto versatility.
- Our Most Durable Phone Yet – Built tough to resist dust and water for reliable everyday protection. IP66/IP68/IP69 and IP19K rated.
- 6.78″ 165 Hz AMOLED Display – Experience vivid colors, ultra-smooth motion, and stunning clarity.
New
OnePlus 13,16GB RAM + 512GB Storage,Dual-SIM,Unlocked Android Smartphone, Snapdragon 8 Elite, 80W SUPERVOOC Fast Charging and 50W AIRVOOC Charging, Advanced Hasselblad Camera, 2025, Midnight Ocean
- Lightning-Fast Snapdragon 8 Elite Processor: Powered by the latest Qualcomm Snapdragon 8 Elite chipset, enjoy exceptional speed, efficiency, and performance for gaming, multitasking, and productivity.
- Massive 6000mAh Battery: Keep going all day long with a large 6000mAh battery that supports fast charging 80W SuperVOOC to get you back up and running quickly.
- Stunning 120Hz ProXDR Display: Experience vibrant colors and ultra-smooth visuals on a QHD+ ProXDR display with a 120Hz refresh rate, perfect for gaming, streaming, and everyday use.
- 5th Gen Hasselblad Camera System: Capture every moment in breathtaking detail with the advanced triple-camera setup featuring a all round 50MP lens for stunning photos and videos, day or night.
- Built-In Ultrasonic Fingerprint Sensor: Unlock your phone securely and effortlessly with the advanced ultrasonic fingerprint sensor for quick access to your device.
Our conclusion on the OnePlus 9 Pro vs Samsung Galaxy S21 Ultra
Both the OnePlus 9 Pro and the Samsung Galaxy S21 Ultra 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 OnePlus 9 Pro and the Samsung Galaxy S21 Ultra are both excellent products that will more than do their job!