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Head to head

Garmin Garmin fēnix 9 51mmvsGarmin Garmin Venu 4 41mm

Released
2026-08-25Garmin newsroom — fēnix 9 and fēnix 9 Pro, retrieved 2026-09-13
Price
£949.99Garmin UK store — fēnix 9 51 mm, retrieved 2026-09-22
Security updates until
2028-08-25Garmin UK — fēnix 9 (Security Information), retrieved 2026-09-22
Released
2025-09-22Garmin newsroom — Venu 4, retrieved 2026-09-13
Price
£439.99Garmin UK store — Venu 4 41 mm, retrieved 2026-09-22
Security updates until
2027-09-29Garmin UK — Venu 4 (Security Information), retrieved 2026-09-22

1 win for Garmin fēnix 9 51mm1 win for Garmin Venu 4 41mm0 differences you won’t notice£510 apart at RRP

Verdict: Garmin fēnix 9 51mm ahead on 1 row, Garmin Venu 4 41mm on 1 row

On the makers’ published figures, the Garmin fēnix 9 51mm wins on battery life (maker's claim) (696 h against 240 h); the Garmin Venu 4 41mm wins on weight (case only) (33 g against 65 g). The other 10 rows have no threshold or no direction to judge by, so nobody wins them.

Specifications

A win is marked only where the figures can be ranked and the gap is one you could notice on the wrist. A row the site has no threshold for says whether the two differ, and that it is not ranking them. = marks the same figure on both, ≠ not ranked a difference with no ranking. Every figure carries its source.

Body

SpecificationGarmin fēnix 9 51mmGarmin Venu 4 41mm
Case size
51mmOfficial
41mmOfficial
Case shapeSame.
roundOfficial
roundOfficial
Weight (case only)
65gOfficial
33gOfficialwins this row

Garmin Venu 4 41mm is ahead here, by a gap you’d notice.

Water rating
10 ATM; 4 ATM Dive (EN 13319)Official
No verified data

Display

SpecificationGarmin fēnix 9 51mmGarmin Venu 4 41mm
Display typeDiffers, but not ranked.
AMOLEDOfficial
Bright colour displayOfficial
Display sizeDiffers, but not ranked.
1.4inOfficial
1.2inOfficial

Battery

SpecificationGarmin fēnix 9 51mmGarmin Venu 4 41mm
Battery life (maker's claim)
29 days (696 h)hOfficialwins this row
10 days (240 h)hOfficial

Garmin fēnix 9 51mm is ahead here, by a gap you’d notice.

Health

SpecificationGarmin fēnix 9 51mmGarmin Venu 4 41mm
SensorsDiffers, but not ranked.
Garmin Elevate wrist heart rate monitor, Pulse Ox blood oxygen saturation monitor, barometric altimeter, compass, gyroscope, accelerometer, thermometer, ambient light sensor, depth sensor (to 40 m)Official
Garmin Elevate wrist heart rate monitor, Pulse Ox blood oxygen saturation monitor, barometric altimeter, compass, gyroscope, accelerometer, thermometer, ambient light sensorOfficial
GPSSame.
GPSOfficial
GPSOfficial

Connectivity

SpecificationGarmin fēnix 9 51mmGarmin Venu 4 41mm
Cellular modelSame.
NoOfficial
NoOfficial

Compatibility

SpecificationGarmin fēnix 9 51mmGarmin Venu 4 41mm
Works withSame.
Compatible with iPhone and AndroidOfficial
Compatible with iPhone and AndroidOfficial
CompatibilitySame.
iPhone and AndroidOfficial
iPhone and AndroidOfficial
23 attributes neither watch has a sourced figure for

Dimensions · Case material · Strap width · Display area · Resolution · Peak brightness · Always-on display · Operating system · Chip · Storage · RAM · Battery capacity · Charge to 80% · Charging · ECG · Blood oxygen · Skin temperature · Blood pressure · Cellular model price · UK networks with eSIM · Wi-Fi · Bluetooth · NFC payments. Rows appear as sources are cited — a gap in our data, not a statement about either watch.

The pairs a buyer of either watch would also weigh. Any two watches in the catalogue can be compared from the chooser.