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Galaxy S21 Ultra
Company ProductName Specs
Company ProductName Specs

What we think

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The PerfectRec phone team Learn more
Updated January 10, 2024·

If a superior camera is a priority, the Samsung Galaxy S21 Ultra has a higher overall camera quality and more versatile camera system with telephoto and periscope lenses offering impressive zoom capabilities. However, if you prefer a lighter device with slightly longer battery life, and if spending less is important, the OnePlus 9 could be the right choice for you. Both phones have powerful processors, but the Galaxy S21 Ultra boasts a larger screen with a higher resolution, making it better for media consumption. Keep in mind that both have different ecosystems, as the OnePlus uses OxygenOS and Samsung employs One UI, both based on Android. If expandable storage through an SD card is crucial, neither of these phones supports it. Give Feedback

this description is based on the product variant with some specs and product variant with some specs. At the time of writing, the variant with some specs cost some dollars and the variant with some specs cost some dollars.

Get a great deal on the OnePlus 9 or the Samsung Galaxy S21 Ultra

Key differences

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Overall Camera Quality

Galaxy S21 Ultra
The Samsung Galaxy S21 Ultra and OnePlus 9 both have good overall camera quality, though the Samsung Galaxy S21 Ultra has somewhat better overall camera quality.

Photo Quality

Galaxy S21 Ultra
The Samsung Galaxy S21 Ultra takes good photos, while the OnePlus 9 takes only fair photos.

Video Quality

Galaxy S21 Ultra
The Samsung Galaxy S21 Ultra takes good videos, while the OnePlus 9 takes poor videos.


Galaxy S21 Ultra
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Product image







The OnePlus 9 has a price of $445 and the Samsung Galaxy S21 Ultra costs $379.
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Key similarities

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6.9 Hours
Galaxy S21 Ultra
6.7 Hours
The OnePlus 9 has 6.9 hours of battery life. The Samsung Galaxy S21 Ultra has 6.7 hours of battery life.

Screen Size

The OnePlus 9 has a screen size of 6.55 inches and the Samsung Galaxy S21 Ultra is 6.8 inches.

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How the OnePlus 9 and the Samsung Galaxy S21 Ultra compare to other phones

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Spec Comparison

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OnePlus 9Samsung Galaxy S21 Ultra
OnePlus 9Samsung Galaxy S21 Ultra


Operating System
Release Date
March 26, 2021January 29, 2021


Screen Size
2400 x 10803200 x 1440
Variable refresh rate
Pixels Per Inch
Display Type


Internal Storage
128 gb128 gb
8 gb12 gb


Overall Camera Quality Score
Photos Score
Videos Score
Rear Cameras
Main, UltrawideMain, Ultrawide, Telephoto, Super Telephoto
Main Camera
48 megapixels108 megapixels + OIS


Battery Life
6.9 hours6.7 hours
Battery Capacity
4500 mah5000 mah
Wireless Charging
Wireless charging Speed
15 w15 w
Reverse wireless charging
NoYes (4.5 watts)


6.29" x 2.92"6.5" x 2.98"
6.77 oz8.01 oz
Back Material
Stereo Speakers


Dual SIM
Bluetooth Version
WiFi Version
US 5G Bands
(SA/NSA/Sub6)1, 2, 3, 5, 7, 8, 20, 25, 28, 38, 40, 41, 48, 66, 71, 77, 78(SA/NSA/Sub6/mmWave)2, 5, 25, 41, 66, 71, 260, 261 (SA/NSA/Sub6)1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78


Biometric unlock
Face unlock, Fingerprint sensor: Under DisplayFace unlock, Fingerprint sensor: Under Display
Unlockable Bootloader
Astral Black, Arctic Sky, Winter MistPhantom Black, Phantom Silver, Phantom Navy, Phantom Titanium
Stock Android
SD Card

Comparison summary

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Comparison Summary
Better CameraSamsung Galaxy S21 Ultra
Better Battery Roughly equal
Better ScreenSamsung Galaxy S21 Ultra


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OnePlus 9

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Dig into reviews and images


David Lumb | April 2021
"If you’re hunting for the best Android camera phone at this price, and one that doesn’t skimp on specs the OnePlus 9 is worth considering. Courtesy of a partnership with Hasselblad, the cameras offer better color correction, and both regular and ultra-wide photos look great. The OnePlus 9’s battery fully charges in under 30 minutes over a cable, and in 45 minutes using wireless charging. If you hate waiting for hours to charge your phone, you'll love the OnePlus 9."

Samsung Galaxy S21 Ultra

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Dig into reviews and images

Android Authority

David Imel | January 2023
"The Galaxy S21 Ultra is a killer combo of great design, blazing-fast performance, a wonderful display, long-lasting battery life, and one of the most versatile camera systems you can get in a smartphone today."

About OnePlus

OnePlus, established in 2013, is a smartphone brand that first became known for providing flagship-like devices, at a fraction of the cost compared to more expensive Android competitors. OnePlus focuses on creating smartphones with powerful hardware at reasonable prices. They also bring hardware features normally not seen in other Android phones sold in the US, such as their ultra-fast “Warp Charge” and the beloved “Alert Slider”.

About Samsung

Samsung is one of the most recognizable names in the smartphone industry, standing as the undisputed best-selling brand of Android smartphones in the United States for many years now. Samsung is known for offering a variety of smartphones in all available price points, as well as for implementing cutting-edge technology and innovative features in their flagship devices, ones that often shape the market going forward. The company offers its own unique spin on Android, called One UI, which focuses on offering a multitude of features and is heavily customizable, according to user preference.

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Why trust us

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This information was produced and vetted by the PerfectRec phones team. We are a product research and recommendation organization that meticulously reviews and evaluates the latest phone information and makes it digestible for you.

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About the phone team

Joe Golden, Ph.D

CEO and Phones Editor
Joe is an entrepreneur and lifelong electronics enthusiast with a Ph.D in Economics from the University of Michigan.

Nick Landia, Ph.D

Chief Data Scientist
Nick is a machine learning expert with a Ph.D in recommendation systems from the University of Warwick.

Aaron Koller, Ph.D

Head of Product
Aaron is a product leader and recommendation enthusiast with a Ph.D in philosophy from Syracuse University.

Jason Lew

Staff Expert & Software Engineer
Jason is a staff expert and software engineer that has been making laptop recommendations for 7 years and moderates one of the largest laptop subreddits.

Chandradeep Chowdhury

Staff Expert & Software Engineer
Chandradeep is a staff expert and software engineer and expert in televisions and monitors. He’s been making monitor recommendations for ten years.

Seth Peoples

Phones Expert
Seth is a US-based product expert focusing on smartphones and he is a moderator of one of the largest smartphone subreddits. His tailored recommendations have helped him earn over 87k comment karma, putting him in the top 1% of Redditors.

Efthimis Kotanidis

Phones Expert
Efthimis is a Greece-based product expert focusing on smartphones. He has been recommending phones for 4 years and his recommendations on Reddit have earned him over 35k karma.

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