40 mm Case Size — 3 Smartwatches Compared

Decision table

40 mm Case Size: which one for what?

The 3 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 Watch8 40mm77%

Leads for Sport & Outdoors: Galaxy Watch8 40mm72%

Leads for Battery Life: Galaxy Watch8 40mm64%

Leads for Daily Use: Galaxy Watch8 40mm68%

#3#3#3#3
Apple Watch SE 3 40mmApple
40 mm · up to 18 hours · 50m
65% 53% 50% 59%
Why it ranks here
- Editorial tag: Health Tracking
Why it ranks here
- Water resistance to 50 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
- 40 mm case
#2#2#2#2
Galaxy Watch9 40mmSamsung
40 mm · up to 30 hours · Yes
77% 65% 57% 65%
Why it ranks here
- Editorial tag: Health Tracking
- ECG
- Blood oxygen sensor
Why it ranks here
- Dual-band GNSS
- Water resistance to 50 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
- 40 mm case
#1#1#1#1
Galaxy Watch8 40mmSamsung
40 mm · up to 40 hours · Yes
77% 72% 64% 68%
Why it ranks here
- Editorial tag: Health Tracking
- ECG
- Blood oxygen sensor
Why it ranks here
- 40 hours of battery
- Dual-band GNSS
- Water resistance to 50 m
Why it ranks here
- 40 hours of battery
How long does the battery last?
Why it ranks here
- Editorial tag: Daily Use
- 40 mm case