Home Phone comparison Xiaomi Mi 9 and OnePlus Ace 6 - Which is better?

Xiaomi Mi 9 vs OnePlus Ace 6

50 out 100
Xiaomi Mi 9
VS
89 out 100
OnePlus Ace 6
Xiaomi Mi 9
OnePlus Ace 6

Compared 2 smartphones : Xiaomi Mi 9 Manufactured in April, 2019, with display 6.39 with chipsetQualcomm Snapdragon 855, vs OnePlus Ace 6, Manufactured in October, 2025 with 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 Xiaomi Mi 9
  • Lighter design: 173g vs 213g
Reasons to choose OnePlus Ace 6
  • Larger display: 6.83in
  • Higher pixel density: 450ppi
  • Higher refresh rate: 165Hz
  • Higher battery capacity: 7800mAh vs 3300mAh
  • Newer Bluetooth version: 5.4 vs 5

Versions

Available versions and configurations
Memory Options - 6/64 GB
- 6/128 GB
- 8/64 GB
- 8/128 GB
- 8/256 GB		 - 12/256 GB
- 12/512 GB
- 16/256 GB
- 16/512 GB
- 16/1024 GB

Review

Key Specs Xiaomi Mi 9 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:
Xiaomi Mi 9
vs
OnePlus Ace 6

Display

Display quality comparison
Type AMOLED AMOLED
Size 6.39 in 6.83 in
Resolution 1080x2340 pixels 1272x2800 pixels
Aspect ratio 19.5:9 19.5:9
Pixel density 403 ppi 450 ppi
Refresh rate 60 Hz 165 Hz
Adaptive refresh rate No Yes (1-120 Hz)
Max brightness 600 nits 800 nits
HDR support Yes HDR10 Yes, Dolby Vision
Touch Sampling Rate n/a 300 Hz
Screen-to-body ratio 85.3 % 91 %
Features - Always-On Display
- DC dimming		 - DCI-P3
- Always-On Display
- DC dimming
Display test
Peak brightness (auto)
Xiaomi Mi 9
619 nits
OnePlus Ace 6
n/a
sRGB gamut95.4 %n/a
PWM (Flicker)245 Hzn/a
Response time4.2 msn/a
Contrast∞ Infiniten/a
Sources: NotebookCheck [Xiaomi Mi 9]

Design & Build

Design and ergonomics comparison
Height 157.5 mm (6.2 in) 163.4 mm (6.43 in)
Width 74.6 mm (2.94 in) 77 mm (3.03 in)
Thickness 7.6 mm (0.3 in) 8.3 mm (0.33 in)
Weight 173 g (6.1 oz) 213 g (7.51 oz)
Water resistance No IP69
Cooling system n/a Vapor chamber
Back panel Glass Glass
Frame Metal Metal
Colors - Black
- Blue
- Purple		 - White
- Black
- Silver
Fingerprint sensor Yes In-Display Yes, In-Display
Screen-to-body ratio
Xiaomi Mi 9
85.3 %
OnePlus Ace 6
91 %

Performance

Testing Xiaomi Mi 9 and OnePlus Ace 6 In benchmarks
Processor
Chipset Qualcomm Snapdragon 855 Qualcomm Snapdragon 8 Elite
Max Frequency 2840 MHz 4320 MHz
CPU Cores 8 (1 + 3 + 4) 8 (2 + 6)
Architecture - 4/1.8 (Cortex-A55 (Kryo 485 Silver))
- 3/2.42 (Cortex-A76 (Kryo 485 Gold))
- 1/2.84 (Cortex-A76 (Kryo 485 Gold))		 - 6/3.53 (Oryon (Phoenix M))
- 2/4.32 (Oryon (Phoenix L))
Process TSMC TSMC
Transistor Size 7 nm 3 nm
Neural Processor Hexagon 690 Hexagon
Graphics Adreno 640 Adreno 830
GPU Cores 768 1536
GPU Frequency 585 MHz 1100 MHz
FLOPS 898.5 GFLOPS 3379.2 GFLOPS
GeekBench v6
Geekbench 6 (Single-Core)
Xiaomi Mi 9
898
OnePlus Ace 6
3160
Geekbench 6 (Multi-Core)
Xiaomi Mi 9
2206
OnePlus Ace 6
9736
Geekbench 6 (Single-Core)8983160
Geekbench 6 (Multi-Core)22069736
Sources: Geekbench v6 [OnePlus Ace 6]
AnTuTu 10
AnTuTu 10
Xiaomi Mi 9
651041
OnePlus Ace 6
3114604
CPU209300856857
GPU1917471148661
Memory113809455327
UX136185653759
NanoReview Score6510413114604
3DMark Wild Life
3DMark Wild Life
Xiaomi Mi 9
3100
OnePlus Ace 6
n/a
Max Surface Temp.35.6 °Cn/a
Stability91 %n/a
Graphics Test18 fpsn/a
Graphics Score3100n/a
Sources: 3DMark [Xiaomi Mi 9]
PCMark 3.0
PCMark 3.0
Xiaomi Mi 9
10649
OnePlus Ace 6
n/a
Writing score14618n/a
Web score7084n/a
Video editing6715n/a
Data manipulation7931n/a
NanoReview Score10649n/a

Memory

RAM
RAM Size 6 GB 12 GB
Memory Type LPDDR4X LPDDR5X
Memory Frequency 2133 MHz 5300 MHz
Channels 2 4
Storage
Storage Capacity128 GB256 GB
Storage TypeUFS 2.1UFS 4.1
Memory CardNoNo

Software

OS Android 9.0 (Upgradeable to Android 11) Android 16
OS Size 13.5 GB n/a
UI Skin MIUI 12.5 ColorOS 16

Battery

Volume 3300 mAh 7800 mAh
Max Charging Power 27 W 120 W
Battery Type Li-Po Silicon Carbon (Si/C)
Removable No No
Wireless Charging Yes (20 W) No
Reverse Charging No Yes
Fast Charging Yes Quick Charge 4 (50% in 30 min) Yes (58% in 20 min)
Full Charge Time 1:30 h 0:44 h
Battery Life Test
Battery Life
Xiaomi Mi 9
17:14
OnePlus Ace 6
n/a
Web Browsing06:08 hn/a
Video Playback11:37 hn/a
Games04:07 hn/a
Standby Mode83 hn/a

Main camera

Matrix 48 MP 50 MP
Photo resolution 8000x6000 pixels 8192x6144 pixels
Zoom Optical, 2x Digital
Flash Dual LED Dual LED
Stabilization Digital Optical
8K Recording No 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 (1080p) 240 fps (1080p)
Wide-angle lens 117 ° 112 °
Lenses count Standard: 48 MP
Telephoto: 12 MP
Ultra-wide: 16 MP		 Standard: 50 MP
Ultra-wide: 8 MP
Features - Bokeh effect
- Pro mode
- RAW support		 - Bokeh effect
- Pro mode
- RAW support
Main lens
Matrix48 MP50 MP
Aperturef/1.8f/1.8
Focal length27 mm24 mm
SensorSony IMX586Sony LYTIA-T808
Sensor size1/21/1.43
Pixel size0.8 μm1.12 μm
AutofocusLaser autofocusPhase autofocus
StabilizationDigitalOptical
Telephoto
Matrix12 MPn/a
Aperturef/2.2n/a
Focal length54 mmn/a
SensorSamsung S5K3M5n/a
Sensor size1/3.6n/a
Pixel size1 μmn/a
StabilizationDigitaln/a
Ultra-wide lens
Matrix16 MP8 MP
Aperturef/2.2f/2.2
Focal length13 mm16 mm
SensorSony IMX481Omnivision OV08D10
Sensor size1/3.01/4.0
Pixel size1 μm1.12 μm
StabilizationDigitalDigital
Main camera DxOMark results
Photo quality
Xiaomi Mi 9
112
OnePlus Ace 6
n/a
Video quality
Xiaomi Mi 9
99
OnePlus Ace 6
n/a
Overall camera score
Xiaomi Mi 9
107
OnePlus Ace 6
n/a
Sources: DxOMark [Xiaomi Mi 9]

Front camera

Matrix 20 MP 16 MP
Photo resolution 5184x3880 pixels 4608x3456 pixels
Aperture f/2.0 f/2.4
Focal length 18 mm 23 mm
Sensor CMOS Sony IMX480
Sensor size 1/3 1/3.09
Pixel size 0.9 μm 1 μm
Autofocus No No
Stabilization Digital Digital
Video resolution 1080p (Full HD) at 30 fps 1080p (Full HD) at 30 fps
TOF 3D sensor No No

Connectivity

Wi-Fi version Wi-Fi 5 (802.11 a/b/g/n/ac) Wi-Fi 7 (802.11 a/b/g/n/ac/ax/be)
Wi-Fi features - Dual Band
- 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 5.4
Bluetooth features LE, A2DP LE
USB type USB Type-C USB Type-C
USB version 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 Yes Yes
Connectivity
SIM Count*22
SIM TypeNanoNano
SIM ModeDual SIM StandbyDual SIM Standby
eSIM Support *NoNo
Hybrid SlotNoNo
2G BandsGSM 850, GSM 900, GSM 1800, GSM 1900n/a
3G BandsHSDPA 850, HSDPA 900, HSDPA 1900, HSDPA 2100n/a
LTE Bands*LTE (B800/B900/B1800/B2100/B2300/B2500/B2600)
LTE category20n/a
5G SupportNoYes

Sound

Speakers Mono n/a
3.5 mm Jack No No
FM Radio No No
Dolby Atmos No No
Speaker Test
Max Volume
Xiaomi Mi 9
87.1 dB
OnePlus Ace 6
n/a

Other

Class Flagship Flagship
Announced February, 2019 yr October, 2025 yr
Release Date April, 2019 yr October, 2025 yr
Launch Price ($) 460 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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