Amazfit T-Rex 3 vs Motorola Watch Ultra: which should you buy?

Answer worked out Oct. 31, 2026

Amazfit T-Rex 3 price: Checked Oct. 30, 2026

Motorola Watch Ultra price: Checked Oct. 30, 2026

Most people: get the Motorola Watch Ultra, because it is the better fit for more of what people buy these for.

Get the Motorola Watch Ultra for running and workouts and heart rate and sleep.

Get the Amazfit T-Rex 3 to save $105.

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Amazfit T-Rex 3 vs Motorola Watch Ultra

Amazfit T-Rex 3
AMAZFIT

Amazfit T-Rex 3

$244.99 at Best Buy
Motorola Watch Ultra
MOTOROLA

Motorola Watch Ultra

$349.99 at Motorola
  1. Amazfit T-Rex 3: 2,000 nitsPeak brightness+700 nitsMotorola Watch Ultra: 2700 nits
  2. Amazfit T-Rex 3: 10 ATMWater resistance−5 ATMMotorola Watch Ultra: 5ATM
  3. Amazfit T-Rex 3: 68.3gWeightDifferent testsMotorola Watch Ultra: 51g
  4. Amazfit T-Rex 3: Typical use: up to 27 days; accurate GPS: up to 42 hrs; GPS max: up to 180 hrsBatteryMotorola Watch Ultra: Up to 2 days with the always-on display off
  5. Amazfit T-Rex 3: $244.99Price today$105 apartMotorola Watch Ultra: $349.99
Amazfit T-Rex 3
Buy at Best Buy$244.99
We may earn a commission.
Motorola Watch Ultra
Buy at Motorola$349.99
We may earn a commission.
All the details

Key differences

  • Peak brightness: 2,000 nits vs 2700 nitsAmazfit T-Rex 3: 2,000 nits (1.5 in AMOLED, 480 × 480, up to 2,000 nits, Gorilla Glass) ConfirmedSourceMotorola Watch Ultra: 2700 nits (1.5-inch curved pOLED, up to 2700 nits, always-on) ConfirmedSource
  • Water resistance: 10 ATM vs 5ATMAmazfit T-Rex 3: 10 ATM (10 ATM; certified for freediving to 147 ft (45 m)) ConfirmedSourceMotorola Watch Ultra: 5ATM (IP68 and 5ATM) ConfirmedSource
  • Weight: 68.3g (without strap) vs 51g (condition not stated), measured differentlyAmazfit T-Rex 3: 68.3g (68.3g without strap) ConfirmedSourceMotorola Watch Ultra: 51g ConfirmedSource

From each maker's own specifications. A point is listed only when both makers state a figure and the two differ; a point either maker does not state is left out, never guessed. Two figures measured under different conditions are shown side by side, not compared.

Who should buy which

  • The Amazfit T-Rex 3 Guide names it for outdoor adventure and hiking.Outdoor adventure: Military-grade build, freediving certification to 147 feet, and it shrugged off rocky Colorado mountain terrain. Source linkedSourceHiking: It logs up to 42 hours in accurate GPS mode during extended hiking trips. Source linkedSource
  • The Motorola Watch Ultra Guide names it for fitness and sleep.Fitness: Fitness tracking powered by Polar, with calorie estimates, activity breaks and dual-band GPS for workouts. Source linkedSourceSleep: Multi-stage sleep tracking with Polar's Sleep Plus Stages and Nightly Recharge. Source linkedSource

From what each Guide names the product best for. Both Guides also name navigation.

Side by side

FeatureAmazfit T-Rex 3Motorola Watch Ultra
Display1.5 in AMOLED, 480 × 480, up to 2,000 nits, Gorilla Glass1.5-inch curved pOLED, up to 2700 nits, always-on
BatteryTypical use: up to 27 daysUp to 2 days with the always-on display offAmazfit27 daysMotorola2 days
Weight68.3g without strap51gAmazfit68.3 gMotorola51 g
Water resistance10 ATMIP68 and 5ATM
ConnectivityDual-band GPS, 6 satellite systemsLTE and dual-band GPS
Design48.5 × 48.5 × 13.75mm46mm stainless steel case
AI assistantZepp Flow voice controlGoogle Gemini, plus Motorola Qira with a compatible Motorola or Lenovo device

Motorola Watch Ultra

Buy at Motorola$349.99
Checked Oct. 30, 2026

We may earn a commission.

Works with your phone

iPhone
WorksNot stated
Android
WorksWorks

Sources

AmazfitMotorola
Amazfit T-Rex 3 vs Withings ScanWatch 2