Amazfit T-Rex 3 Pro vs Withings ScanWatch 2: which to buy?

Our pick

Get the Withings ScanWatch 2

Winner for most people: Withings ScanWatch 2. It is the better fit for running and workouts and heart rate and sleep.

Winner: Withings ScanWatch 2

Dive rating

5 ATM (50m), fine for swimming, not for diving vs 10 ATM; freediving and recreational scuba to 45 m

Display

0.63-inch DeepGray OLED screen in the dial, 282 PPI vs 1.5 in AMOLED (48mm) or 1.32 in AMOLED (44mm), up to...

$349.99Kohl's · Checked Nov. 1, 2026

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All the details

Key differences

Water resistance: 10 ATM vs 5 ATMAmazfit T-Rex 3 Pro: 10 ATM (10 ATM; freediving and recreational scuba to 45 m) ConfirmedSourceWithings ScanWatch 2: 5 ATM (5 ATM (50m), fine for swimming, not for diving) 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, travel and navigation.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. ConfirmedSourceNavigation: Six satellite systems and a circularly polarized antenna held GPS lock through a 4km ride with no dropouts. Source linkedSource
The Withings ScanWatch 2 Guide names it for health, sleep and fitness.Health: Rest a finger on the bezel for 30 seconds and it records an FDA-cleared ECG that checks for atrial fibrillation. Source linkedSourceSleep: Light and deep sleep, interruptions and overnight HRV are tracked, with a smart wake-up alarm and a Breathing Quality Index. Source linkedSourceFitness: It looks like a classic analog watch, yet counts steps and elevation across more than 40 workout modes. Source linkedSource