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

Key differences

Still a tie on the makers' figures: the two are close on peak brightness (3,000 vs 2700 nits). Pick on price, or on what each Guide says it is best for.

• Peak brightness: close (3,000 vs 2700 nits)Amazfit T-Rex Dual Solar: 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 Dual Solar: 10 ATM (10 ATM; freediving to 50 m and recreational scuba) 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 Dual Solar Guide names it for travel and hiking.Travel: Three hours of daily sun on the back stretches a charge from 25 to as many as 51 days, enough for a long trip with no plug. Source linkedSourceHiking: Its dual-sided solar charging extends battery life for hikes far from power outlets. 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.