Home Phone comparison Samsung Galaxy S21 Ultra and OnePlus Ace 6 - Which is better?

Samsung Galaxy S21 Ultra vs OnePlus Ace 6

67 out 100
Samsung Galaxy S21 Ultra
VS
89 out 100
OnePlus Ace 6
Samsung Galaxy S21 Ultra
OnePlus Ace 6

Compared 2 smartphones : Samsung Galaxy S21 Ultra Manufactured in February, 2021, with display 6.8 with chipsetSamsung Exynos 2100, vs OnePlus Ace 6, Manufactured in October, 2025with chipsetQualcomm Snapdragon 8 Elite. Below are specs, tests, pros and cons for each device

  1. Differences
  2. Review
  3. Specs
  4. Benchmarks
  5. Battery Life
  6. Cameras
  7. Comments (0)

Key Differences

Device key advantages
Reasons to choose Samsung Galaxy S21 Ultra
  • Higher pixel density: 515ppi
  • Supports newer USB: 3.2 vs 2
  • Supports Dolby Atmos
  • Built-in eSIM
Reasons to choose OnePlus Ace 6
  • Larger display: 6.83in
  • Higher refresh rate: 165Hz
  • Lighter design: 213g vs 227g
  • Higher battery capacity: 7800mAh vs 5000mAh
  • Newer Bluetooth version: 5.4 vs 5.2
  • Infrared port

Versions

Available versions and configurations
Memory Options - 12/128 GB
- 12/256 GB
- 12/512 GB
- 16/256 GB
- 16/512 GB		 - 12/256 GB
- 12/512 GB
- 16/256 GB
- 16/512 GB
- 16/1024 GB

Review

Key Specs Samsung Galaxy S21 Ultra and OnePlus Ace 6
Display
Color accuracy, sharpness & brightness
Camera
Main & front camera tests
Performance
App & system performance
Games
3D gaming performance
Battery
Battery life, charging speed & type
Connectivity
Connectivity features
NanoReview Score
Overall score by NanoReview
Adjust each parameter’s importance to find the best match for you.
Customize your score
Function
Importance (Weight)
Display:
Camera:
Performance:
Gaming:
Battery:
Connectivity:
Higher weight means greater impact on NanoReview score.

Tests & specs

Specs & test comparison
Smartphones:
Galaxy S21 Ultra
vs
OnePlus Ace 6

Display

Display quality comparison
Type Dynamic AMOLED AMOLED
Size 6.8 in 6.83 in
Resolution 1440x3200 pixels 1272x2800 pixels
Aspect ratio 20:9 19.5:9
Pixel density 515 ppi 450 ppi
Refresh rate 120 Hz 165 Hz
Adaptive refresh rate Yes (10-120 Hz) Yes (1-120 Hz)
Max brightness 1500 nits 800 nits
HDR support Yes HDR10+ Yes, Dolby Vision
Touch Sampling Rate n/a 300 Hz
Screen-to-body ratio 89.5 % 91 %
Features - DCI-P3
- Always-On Display		 - DCI-P3
- Always-On Display
- DC dimming
Display test
Peak brightness (auto)
Samsung Galaxy S21 Ultra
1019 nits
OnePlus Ace 6
n/a
Sources: NotebookCheck [Samsung Galaxy S21 Ultra]

Design & Build

Design and ergonomics comparison
Height 165.1 mm (6.5 in) 163.4 mm (6.43 in)
Width 75.6 mm (2.98 in) 77 mm (3.03 in)
Thickness 8.9 mm (0.35 in) 8.3 mm (0.33 in)
Weight 227 g (8.01 oz) 213 g (7.51 oz)
Water resistance IP68 IP69
Cooling system n/a Vapor chamber
Back panel Glass Glass
Frame Metal Metal
Colors - Black
- Silver
- Gray
- Blue		 - White
- Black
- Silver
Fingerprint sensor Yes In-Display Yes, In-Display
Screen-to-body ratio
Samsung Galaxy S21 Ultra
89.5 %
OnePlus Ace 6
91 %

Performance

Testing Samsung Galaxy S21 Ultra and OnePlus Ace 6 In benchmarks
Processor
Chipset Samsung Exynos 2100 Qualcomm Snapdragon 8 Elite
Max Frequency 2900 MHz 4320 MHz
CPU Cores 8 (1 + 3 + 4) 8 (2 + 6)
Architecture - 4/2.2 (Cortex-A55)
- 3/2.81 (Cortex-A78)
- 1/2.91 (Cortex-X1)		 - 6/3.53 (Oryon (Phoenix M))
- 2/4.32 (Oryon (Phoenix L))
Process Samsung TSMC
Transistor Size 5 nm 3 nm
Neural Processor Yes Hexagon
Graphics Mali-G78 MP14 Adreno 830
GPU Cores 896 1536
GPU Frequency 854 MHz 1100 MHz
FLOPS 1530.4 GFLOPS 3379.2 GFLOPS
GeekBench v6
Geekbench 6 (Single-Core)
Samsung Galaxy S21 Ultra
1449
OnePlus Ace 6
3160
Geekbench 6 (Multi-Core)
Samsung Galaxy S21 Ultra
3892
OnePlus Ace 6
9736
Geekbench 6 (Single-Core)14493160
Geekbench 6 (Multi-Core)38929736
Sources: Geekbench v6 [OnePlus Ace 6]
AnTuTu 10
AnTuTu 10
Samsung Galaxy S21 Ultra
843008
OnePlus Ace 6
3114604
CPU232358856857
GPU2563561148661
Memory163007455327
UX191217653759
NanoReview Score8430083114604
3DMark Wild Life
3DMark Wild Life
Samsung Galaxy S21 Ultra
5221
OnePlus Ace 6
n/a
Max Surface Temp.40.8 °Cn/a
Stability69 %n/a
Graphics Test31 fpsn/a
Graphics Score5221n/a
Sources: 3DMark [Samsung Galaxy S21 Ultra]

Memory

RAM
RAM Size - 12 GB
- 16 GB		 12 GB
Memory Type LPDDR5 LPDDR5X
Memory Frequency 2750 MHz 5300 MHz
Channels 2 4
Storage
Storage Capacity- 128 GB
- 256 GB
- 512 GB		256 GB
Storage TypeUFS 3.1UFS 4.1
Memory CardNoNo

Software

OS Android 11 (Upgradeable to Android 14) Android 16
OS Size 26.4 GB n/a
UI Skin One UI 6 ColorOS 16

Battery

Volume 5000 mAh 7800 mAh
Max Charging Power 25 W 120 W
Battery Type Li-ion Silicon Carbon (Si/C)
Removable No No
Wireless Charging Yes (15 W) No
Reverse Charging Yes (Wireless) Yes
Fast Charging Yes (54% in 30 min) Yes (58% in 20 min)
Full Charge Time 1:11 h 0:44 h
Battery Life Test
Battery Life
Samsung Galaxy S21 Ultra
22:05
OnePlus Ace 6
n/a
Web Browsing07:58 hn/a
Video Playback13:59 hn/a
Games05:14 hn/a
Standby Mode111 hn/a

Main camera

Matrix 108 MP 50 MP
Photo resolution 12000x9000 pixels 8192x6144 pixels
Zoom Optical, 10x Digital
Flash Dual LED Dual LED
Stabilization Optical Optical
8K Recording Up to 24FPS No
4K Recording Yes (Up to 60 fps) Yes (Up to 120 fps)
1080p Recording Yes (Up to 60 fps) Yes (Up to 60 fps)
Slow Motion 960 fps (720p) 240 fps (1080p)
Wide-angle lens 120 ° 112 °
Lenses count Standard: 108 MP
Telephoto: 10 MP
Telephoto: 10 MP
Ultra-wide: 12 MP		 Standard: 50 MP
Ultra-wide: 8 MP
Features - Bokeh effect
- Pro mode
- RAW support		 - Bokeh effect
- Pro mode
- RAW support
Main lens
Matrix108 MP50 MP
Aperturef/1.8f/1.8
Focal length26 mm24 mm
SensorSamsung S5KHM3Sony LYTIA-T808
Sensor size1/1.331/1.43
Pixel size0.8 μm1.12 μm
AutofocusLaser autofocusPhase autofocus
StabilizationOpticalOptical
Telephoto
Matrix10 MPn/a
Aperturef/4.9n/a
Focal length240 mmn/a
SensorSamsung S5K3J1n/a
Sensor size1/2.65n/a
Pixel size1.22 μmn/a
StabilizationOpticaln/a
Ultra-wide lens
Matrix12 MP8 MP
Aperturef/2.2f/2.2
Focal length13 mm16 mm
SensorSony IMX563Omnivision OV08D10
Sensor size1/2.551/4.0
Pixel size1.4 μm1.12 μm
StabilizationDigitalDigital
Main camera DxOMark results
Photo quality
Samsung Galaxy S21 Ultra
121
OnePlus Ace 6
n/a
Video quality
Samsung Galaxy S21 Ultra
100
OnePlus Ace 6
n/a
Overall camera score
Samsung Galaxy S21 Ultra
115
OnePlus Ace 6
n/a
Bokeh70n/a
Preview67n/a
Zoom106n/a
Sources: DxOMark [Samsung Galaxy S21 Ultra]

Front camera

Matrix 40 MP 16 MP
Photo resolution 7864x5200 pixels 4608x3456 pixels
Aperture f/2.2 f/2.4
Focal length 26 mm 23 mm
Sensor Samsung S5KGH1 Sony IMX480
Sensor size 1/2.65 1/3.09
Pixel size 0.7 μm 1 μm
Autofocus Phase autofocus No
Stabilization Digital Digital
Video resolution 2160p (4K) at 60 fps 1080p (Full HD) at 30 fps
TOF 3D sensor No No
Selfie camera DxOMark results
Photo quality
Samsung Galaxy S21 Ultra
133
OnePlus Ace 6
n/a
Video quality
Samsung Galaxy S21 Ultra
140
OnePlus Ace 6
n/a

Connectivity

Wi-Fi version Wi-Fi 6E (802.11 a/b/g/n/ac/ax) Wi-Fi 7 (802.11 a/b/g/n/ac/ax/be)
Wi-Fi features - Dual Band
- Wi-Fi MiMO
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display		 - Dual Band
- Wi-Fi MiMO
- Wi-Fi Direct
- Wi-Fi Hotspot
- Wi-Fi Display
Bluetooth version 5.2 5.4
Bluetooth features LE, A2DP LE
USB type USB Type-C USB Type-C
USB version 3.2 2
USB features - Charging
- USB Storage Mode
- USB-Host mode
- OTG		 - Charging
- USB Storage Mode
- OTG
DisplayPort n/a No
GPS - GPS
- GLONASS
- Beidou
- Galileo		 - GPS
- GLONASS
- Beidou
- Galileo
- QZSS
NFC* Yes Yes
Infrared Port No Yes
Connectivity
SIM Count*22
SIM TypeNanoNano
SIM ModeDual SIM StandbyDual SIM Standby
eSIM Support *YesNo
Hybrid SlotNoNo
2G BandsGSM 850, 900, 1800, 1900 MHzn/a
3G BandsWCDMA Band 1, 2, 4, 5, 8n/a
LTE Bands*LTE (B1/B2/B3/B4/B5/B7/B8/B12/B13/B17/B18/B19/B20/B25/B26/B28/B32/B38/B39/B40/B41/B66)
LTE category24n/a
5G SupportYesYes

Sound

Speakers Stereo n/a
3.5 mm Jack No No
FM Radio No No
Dolby Atmos Yes No
Speaker Test
Max Volume
Samsung Galaxy S21 Ultra
88 dB
OnePlus Ace 6
n/a

Other

Class Flagship Flagship
Announced January, 2021 yr October, 2025 yr
Release Date February, 2021 yr October, 2025 yr
Launch Price ($) 1200 n/a
Sensors - Hall Sensor
- Barometer
- Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor		 - Proximity Sensor
- Gyroscope
- Accelerometer
- Ambient Light Sensor
- Compass
- Fingerprint sensor
* Attention! Config, frequencies, NFC, and other specs may vary by region.

Results

After analyzing the data, we consider OnePlus Ace 6 the clear winner in this comparison.

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