10 ATM Water Resistance — 6 Smartwatches Compared

Decision table

10 ATM Water Resistance: which one for what?

The 6 models on this page are scored only against each other, for the use you pick. Scores come from the spec sheets; no price and no advertising go in.

What will you use it for? Health Tracking Sport & Outdoors Battery Life Daily Use

Leads for Health Tracking: Galaxy Watch Ultra (2025)77%

Leads for Sport & Outdoors: Amazfit T-Rex 384%

Leads for Battery Life: Amazfit T-Rex 376%

Leads for Daily Use: Amazfit Balance 268%

#3#3#3#5
Garmin fēnix 8 47mmGarmin
47 mm · up to 168 hours · Yes
65% 76% 68% 53%
Why it ranks here
- ECG
- Blood oxygen sensor
Why it ranks here
- Editorial tag: Sport & Outdoors
- Dual-band GNSS
- Water resistance to 100 m
Why it ranks here
- Editorial tag: Battery Life
How long does the battery last?
Why it ranks here
- 47 mm case
#4#4#4#4
Garmin Instinct 3 AMOLED 45mmGarmin
45 mm · up to 168 hours · 10 ATM
57% 76% 68% 58%
Why it ranks here
- Blood oxygen sensor
Why it ranks here
- Editorial tag: Sport & Outdoors
- Dual-band GNSS
- Water resistance to 100 m
Why it ranks here
- Editorial tag: Battery Life
How long does the battery last?
Why it ranks here
- 45 mm case
#2#6#6#3
Galaxy Watch Ultra2Samsung
47 mm · up to 60 hours · Yes
77% 58% 50% 67%
Why it ranks here
- Editorial tag: Health Tracking
- ECG
- Blood oxygen sensor
Why it ranks here
- Dual-band GNSS
- Water resistance to 100 m
Why it ranks here
Nothing stands out for this use; the score comes from overall balance.
How long does the battery last?
Why it ranks here
- Editorial tag: Daily Use
- 47 mm case
#1#5#5#2
Galaxy Watch Ultra (2025)Samsung
47 mm · up to 60 hours · Yes
77% 58% 50% 68%
Why it ranks here
- Editorial tag: Health Tracking
- ECG
- Blood oxygen sensor
Why it ranks here
- Dual-band GNSS
- Water resistance to 100 m
Why it ranks here
Nothing stands out for this use; the score comes from overall balance.
How long does the battery last?
Why it ranks here
- Editorial tag: Daily Use
- 47 mm case
#5#1#1#6
Amazfit T-Rex 3Amazfit
48.5 mm · up to 648 hours · 10 ATM
54% 84% 76% 50%
Why it ranks here
- Blood oxygen sensor
Why it ranks here
- Editorial tag: Sport & Outdoors
- 648 hours of battery
- Dual-band GNSS
- Water resistance to 100 m
Why it ranks here
- Editorial tag: Battery Life
- 648 hours of battery
How long does the battery last?
Why it ranks here
- 48.5 mm case
#6#2#2#1
Amazfit Balance 2Amazfit
47.4 mm · up to 504 hours · 10 ATM
50% 81% 73% 68%
Why it ranks here
Nothing stands out for this use; the score comes from overall balance.
Why it ranks here
- Editorial tag: Sport & Outdoors
- 504 hours of battery
- Dual-band GNSS
- Water resistance to 100 m
Why it ranks here
- Editorial tag: Battery Life
- 504 hours of battery
How long does the battery last?
Why it ranks here
- Editorial tag: Daily Use
- 47.4 mm case