Most people: get the COROS PACE 4, because it is the better fit for more of what people buy these for.
Get the COROS PACE 4 for running and workouts.
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Amazfit T-Rex Ultra 2 vs COROS PACE 4
AMAZFIT
Amazfit T-Rex Ultra 2
$549.99 at Amazon
TALE OF THE TAPEVS
COROS
COROS PACE 4
$249 at COROS
Amazfit T-Rex Ultra 2: 10 ATMWhy we say thisConfirmedAmazfit says this. iDevice checked the exact words on that page.The claimWater resistance10 ATMSee the sourceAmazfit↗ROUND 1Water resistance−5 ATMCOROS PACE 4: 5 ATMAbout this sourceSource linkedYou can read the source. We haven't checked its exact wording.The claimWater resistance10 ATM to 5 ATMRead the sourcecoros.com↗
Amazfit T-Rex Ultra 2: 1.5 in AMOLED, 480 × 480, up to 3,000 nits, sapphire glassWhy we say thisConfirmedAmazfit says this. iDevice checked the exact words on that page.The claimDisplay1.5 in AMOLED, 480 × 480, up to 3,000 nits, sapphire glassSee the sourceAmazfit↗ROUND 2DisplayCOROS PACE 4: 1.2 in always-on AMOLED touchscreen, 390 × 390, mineral glassAbout this sourceSource linkedYou can read the source. We haven't checked its exact wording.The claimDisplay1.5 in AMOLED, 480 × 480, up to 3,000 nits, sapphire glass to 1.2 in always-on AMOLED touchscreen, 390 × 390, mineral glassRead the sourcecoros.com↗
Amazfit T-Rex Ultra 2: Typical use: up to 30 days; heavy use: up to 15 days; accurate GPS: up to 50 hrs; GPS max: 177 hrsWhy we say thisConfirmedAmazfit says this. iDevice checked the exact words on that page.The claimBatteryTypical use: up to 30 days; heavy use: up to 15 days; accurate GPS: up to 50 hrs; GPS max: 177 hrsSee the sourceAmazfit↗ROUND 3BatteryCOROS PACE 4: GPS: 41 hrs (30 hrs always-on); dual-frequency: 31 hrs (24 hrs); daily: 19 days (6 days always-on)About this sourceSource linkedYou can read the source. We haven't checked its exact wording.The claimBatteryTypical use: up to 30 days; heavy use: up to 15 days; accurate GPS: up to 50 hrs; GPS max: 177 hrs to GPS: 41 hrs (30 hrs always-on); dual-frequency: 31 hrs (24 hrs); daily: 19 days (6 days always-on)Read the sourcecoros.com↗
Amazfit T-Rex Ultra 2: 89.2g with strapWhy we say thisConfirmedAmazfit says this. iDevice checked the exact words on that page.The claimWeight89.2g with strapSee the sourceAmazfit↗ROUND 4WeightCOROS PACE 4: 32g (nylon), 40g (silicone)About this sourceSource linkedYou can read the source. We haven't checked its exact wording.The claimWeight89.2g with strap to 32g (nylon), 40g (silicone)Read the sourcecoros.com↗
Water resistance: 10 ATM vs 5 ATMAmazfit T-Rex Ultra 2: 10 ATM (10 ATM; freediving and recreational scuba to 45 m) ConfirmedSourceCOROS PACE 4: 5 ATM (5 ATM (surface water, not 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 Ultra 2 Guide names it for outdoor adventure.Outdoor adventure: Freediving or recreational scuba, it is certified for diving to 45 meters. ConfirmedSource
The COROS PACE 4 Guide names it for running.Running: Threshold pace and race-time estimates proved useful and accurate on runs, and training load and recovery stats come built in. Source linkedSource
From what each Guide names the product best for. Both Guides also name travel and navigation.
