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InnoReviews

Samsung Galaxy S21 Ultra vs Xiaomi 15

Samsung Galaxy S21 Ultra
53.9Inno Score
VS
WINNER
Xiaomi 15

Xiaomi

Xiaomi 15
73.4Inno Score
37.2Performance76.7
56.3Display64.5
72Camera64.7
46.4Battery83.5
78.7Features78.7
5 spec wins — Samsung Galaxy S21 Ultra15 spec wins — Xiaomi 15

InnoReviews verdict

Xiaomi 15 wins this phone face-off, 73.4 to 53.9, pulling ahead mainly in performance (+40) and battery (+37). Samsung Galaxy S21 Ultra still makes sense if its price or standout specs fit your needs better.

Which would you pick?

Key differences

Reasons to pick the Samsung Galaxy S21 Ultra

  • Stronger camera score: 72 vs 65
  • 285% higher Optical zoom: 10 x vs 2.6 x
  • 116% higher Main camera: 108 MP vs 50 MP
  • 25% higher Front camera: 40 MP vs 32 MP
  • 12% higher Pixel density: 515 ppi vs 460 ppi

Reasons to pick the Xiaomi 15

  • Stronger performance score: 77 vs 37
  • Stronger display score: 65 vs 56
  • Stronger battery score: 84 vs 46
  • 743% higher AnTuTu 11 (GPU): 1,069,991 vs 126,989
  • 400% higher telephoto: 50 MP vs 10 MP

Display

Display comparison: Samsung Galaxy S21 Ultra versus Xiaomi 15
SpecSamsung Galaxy S21 UltraXiaomi 15
Screen size6.8 ″+7%6.36 ″
Panel typeLTPO AMOLEDLTPO AMOLED
Resolution3200x14401200x2670
Pixel density515 ppi+12%460 ppi
Refresh rate120 Hz120 Hz
Peak brightness1,500 nits3,200 nits+113%

Performance

Performance comparison: Samsung Galaxy S21 Ultra versus Xiaomi 15
SpecSamsung Galaxy S21 UltraXiaomi 15
ChipsetSamsung Exynos 2100Snapdragon 8 Elite
AnTuTu 11783,817Bottom 22%2,914,100+272%Top 17%
AnTuTu 11 (CPU)263,424Bottom 17%874,340+232%Top 14%
AnTuTu 11 (GPU)126,989Bottom 33%1,069,991+743%Top 17%
AnTuTu 11 (Memory)165,563Bottom 35%379,667+129%Top 20%
AnTuTu 11 (UX)227,841Bottom 20%590,102+159%Top 20%
Geekbench 6 (single)1,430Top 46%2,972+108%Top 15%
Geekbench 6 (multi)3,550Bottom 50%9,330+163%Top 12%
Wild Life Extreme stability—89 %Top 50%
RAM (max)12 GB12 GB
Storage options128GB / 256GB / 512GB256/512GB
Storage typeUFS 3.1UFS 4.0

Camera

Camera comparison: Samsung Galaxy S21 Ultra versus Xiaomi 15
SpecSamsung Galaxy S21 UltraXiaomi 15
Main camera108 MP+116%50 MP
Main aperturef/1.8f/1.62
Ultra-wide12 MP50 MP+317%
Telephoto10 MP50 MP+400%
Optical zoom10 x+285%2.6 x
Max video8K@24fps8K@30fps
Front camera40 MP+25%32 MP
OISYesYes

Battery

Battery comparison: Samsung Galaxy S21 Ultra versus Xiaomi 15
SpecSamsung Galaxy S21 UltraXiaomi 15
Capacity5,000 mAh5,240 mAh+5%
Wired charging25 W90 W+260%
Wireless charging15 W50 W+233%
Active use endurance—16.5 h

Design

Design comparison: Samsung Galaxy S21 Ultra versus Xiaomi 15
SpecSamsung Galaxy S21 UltraXiaomi 15
Weight228 g191 g+16%
Thickness8.9 mm8.1 mm+9%
IP ratingIP68IP68
Frame materialAluminumAluminum

Connectivity

Connectivity comparison: Samsung Galaxy S21 Ultra versus Xiaomi 15
SpecSamsung Galaxy S21 UltraXiaomi 15
5GYesYes
Wi-FiWi-Fi 6EWi-Fi 7
Bluetooth5.26.0
NFCYesYes
USBUSB-C 3.2USB-C 3.2
eSIMYesYes

Software

Software comparison: Samsung Galaxy S21 Ultra versus Xiaomi 15
SpecSamsung Galaxy S21 UltraXiaomi 15
OS at launchAndroid 11 (One UI 3.1)Android 15 (HyperOS 2)
OS update pledge4 years4 years

Audio

Audio comparison: Samsung Galaxy S21 Ultra versus Xiaomi 15
SpecSamsung Galaxy S21 UltraXiaomi 15
Stereo speakersYesYes
3.5mm jackNoNo

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