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What we think
The PerfectRec phone team Learn more
Updated January 10, 2024·
If you prioritize camera capabilities, the Samsung Galaxy S21+ has slightly better overall quality, with a higher megapixel telephoto camera and support for HDR10+ in video. However, the OnePlus 9 Pro also performs well in camera quality, offering more RAM for potentially smoother performance. Both have similar battery life, but the OnePlus has a slight edge in battery longevity. If screen resolution is important, the OnePlus 9 Pro provides a higher display resolution. Both phones have a similar size and weight, high refresh rates, and no headphone jack. For those interested in an alert slider, only the OnePlus 9 Pro includes this feature. Both run on Android, share the same processor, offer 5G connectivity, and are similarly priced, but decide based on which features align best with your preferences. 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.
Advantages of the OnePlus 9 Pro
- Best in class display quality
Advantages of the Samsung Galaxy S21+
- Very good battery life
Key differences
Video Quality
6.0
6.6
The Samsung Galaxy S21+ and OnePlus 9 Pro both have only fair videos, though the Samsung Galaxy S21+ takes somewhat better videos.
The OnePlus 9 Pro offers exceptional video resolution and frame rates, which results in high-quality, smooth video capture and its stability ensures steady footage even when in motion. In contrast, the Samsung Galaxy S21+ provides a robust video software experience leading to an intuitive video capturing process and superior mic quality, which enhances the overall audio recording.
Battery
6.9 Hours
8.0 Hours
The OnePlus 9 Pro has 6.9 hours of battery life. The Samsung Galaxy S21+ has 8 hours of battery life.
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Key similarities
Overall Camera Quality
7.2
7.2
The Samsung Galaxy S21+ and OnePlus 9 Pro both have good overall cameras quality.
The OnePlus 9 Pro and the Samsung Galaxy S21+ both offer good selfie camera performance, which is highly important for users focused on self-portraits. However, they also ensure a competent overall camera experience with capabilities in high-resolution photography, dynamic imaging, and versatile camera options for various shooting situations, while providing satisfactory video and audio qualities for multimedia purposes.
Photo Quality
7.0
7.0
The OnePlus 9 Pro and Samsung Galaxy S21+ both have good photos.
The OnePlus 9 Pro offers a solid photo software experience and versatile camera options, but its selfie performance is outshone by the Samsung Galaxy S21+, which provides very good selfie quality. The OnePlus 9 Pro still takes good photos overall, yet for selfie enthusiasts, the Galaxy S21+ might be the better choice due to its higher selfie quality despite its similar software capabilities.
Screen Size
The OnePlus 9 Pro has a screen size of 6.7 inches and the Samsung Galaxy S21+ is 6.7 inches.
Cost
$365
$340
$100
$200
$300
$400
$500
$600
The OnePlus 9 Pro has a price of $365 and the Samsung Galaxy S21+ costs $340.
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How the OnePlus 9 Pro and the Samsung Galaxy S21+ compare to other phones
Spec Comparison
 |  | |
| OnePlus 9 Pro | Samsung Galaxy S21+ |
GENERAL | |||
|---|---|---|---|
| Price | |||
$365 | $340 | ||
Brand | |||
Brand | OnePlus | Samsung | |
Operating System | |||
Operating System | Android | Android | |
Release Date | |||
Release Date | March 30, 2021 | January 29, 2021 | |
SCREEN | |||
|---|---|---|---|
Screen Size | |||
Screen Size | 6.7" | 6.7" | |
Resolution | |||
Resolution | 3216 x 1440 | 2400 x 1080 | |
Variable refresh rate | |||
Variable refresh rate | Yes | No | |
Pixels Per Inch | |||
Pixels Per Inch | 525 | 394 | |
Display Type | |||
Display Type | OLED | OLED | |
INTERNAL | |||
|---|---|---|---|
Processor | |||
Processor | SD888 | SD888 | |
Internal Storage | |||
Internal Storage | 128 GB | 128 GB | |
RAM | |||
RAM | 12 GB | 8 GB | |
CAMERA | |||
|---|---|---|---|
Overall Camera Quality Score | |||
Overall Camera Quality Score | 7.2/10 | 7.2/10 | |
Photos Score | |||
Photos Score | 7.1/10 | 7/10 | |
Videos Score | |||
Videos Score | 6.1/10 | 6.6/10 | |
Rear Cameras | |||
Rear Cameras | Main, Ultrawide, Telephoto | Main, Ultrawide, Telephoto | |
Main Camera | |||
Main Camera | 48 megapixels + OIS | 12 megapixels + OIS | |
BATTERY | |||
|---|---|---|---|
Battery Life | |||
Battery Life | 6.9 Hours | 8 Hours | |
Battery Capacity | |||
Battery Capacity | 4500 mAh | 4800 mAh | |
Wireless Charging | |||
Wireless Charging | Yes | Yes | |
Wireless charging Speed | |||
Wireless charging Speed | 50 W | 15 W | |
Reverse wireless charging | |||
Reverse wireless charging | Yes (4.5 watts) | Yes (4.5 watts) | |
PHYSICAL | |||
|---|---|---|---|
Size | |||
Size | 6.43" x 2.9" | 6.36" x 2.98" | |
Weight | |||
Weight | 6.95 oz | 7.05 oz | |
Back Material | |||
Back Material | Glass | Glass | |
Stereo Speakers | |||
Stereo Speakers | No | No | |
CONNECTIVITY | |||
|---|---|---|---|
Dual SIM | |||
Dual SIM | No | Yes | |
Bluetooth Version | |||
Bluetooth Version | 5.2 | 5.0 | |
A2DP | |||
A2DP | Yes | Yes | |
WiFi Version | |||
WiFi Version | 6 | 6 | |
NFC | |||
NFC | Yes | Yes | |
US 5G Bands | |||
US 5G Bands | (SA/NSA/Sub6/mmWave)1, 2, 3, 7, 25, 28, 41, 66, 71, 78, 258, 260, 261 (SA/NSA/Sub6)41, 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 | |
OTHER FEATURES | |||
|---|---|---|---|
Biometric unlock | |||
Biometric unlock | Face unlock, Fingerprint sensor: Under Display | Face unlock, Fingerprint sensor: Under Display | |
Unlockable Bootloader | |||
Unlockable Bootloader | Yes | No | |
Color | |||
Color | Stellar Black, Forest Green, Morning Mist | Phantom Black, Phantom Silver, Phantom Violet, Phantom Pink, Phantom Gold, Phantom Red | |
Stock Android | |||
Stock Android | No | No | |
SD Card | |||
SD Card | No | No | |
Shopping
OnePlus 9 Pro
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TechRadar
James Peckham | April 2021
"The OnePlus 9 Pro offers phenomenal performance, a vastly superior camera to the brand’s previous smartphones, and a variety of top-end features that make this a serious contender for anyone who’s in the market for a premium Android handset.The 6.7-inch 120Hz QHD display is among the best we’ve seen on a smartphone, with plenty of detail, strong brightness, and a variety of other tweaks. If you like to watch a lot of video on your phone in particular, this is a great option."
Samsung Galaxy S21+
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Tom's Guide
Jordan Palmer | May 2022
"All told, Samsung nailed it with the Galaxy S21 Plus. It has most of the strengths of the smaller S21 in a bigger package. It’s got a lot going for it. If you’re coming from an older device, like the Galaxy S10 series, this is a solid upgrade."
Get a great deal on the OnePlus 9 Pro or the Samsung Galaxy S21+
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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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.
By the numbers
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Phones evaluated
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Recommendations made
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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.
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.
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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.
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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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