Amazfit T-Rex 3 Pro vs Motorola Watch Ultra: which to buy?

Our pick

Get the Motorola Watch Ultra

Winner for most people: Motorola Watch Ultra. It is the better fit for running and workouts and heart rate and sleep.

Winner: Motorola Watch Ultra

Get the Amazfit T-Rex 3 Pro only if you want it for outdoors and hiking.

$349.99Motorola · Checked Nov. 1, 2026

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All the details

Key differences

Peak brightness: close (3,000 vs 2700 nits)Amazfit T-Rex 3 Pro: 3,000 nits 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 Pro: 10 ATM (10 ATM; freediving and recreational scuba to 45 m) ConfirmedSourceMotorola Watch Ultra: 5ATM (IP68 and 5ATM) 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 Pro Guide names it for outdoor adventure and travel.Outdoor adventure: Certified for diving to 45 meters, it suits both freediving and recreational scuba diving. ConfirmedSourceTravel: For a trip, typical use battery life runs up to 25 days on the 48mm and 17 days on the 44mm. ConfirmedSource
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