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Head to head

Garmin Garmin fēnix 9 43mmvsGarmin Garmin Venu 4 45mm

Released
2026-08-25Garmin newsroom — fēnix 9 and fēnix 9 Pro, retrieved 2026-09-13
Price
£859.99Garmin UK store — fēnix 9 43 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 45 mm, retrieved 2026-09-22
Security updates until
2027-09-29Garmin UK — Venu 4 (Security Information), retrieved 2026-09-22

0 wins for Garmin fēnix 9 43mm1 win for Garmin Venu 4 45mm2 gaps borderline0 differences you won’t notice£420 apart at RRP

Verdict: Garmin Venu 4 45mm ahead on 1 row, Garmin fēnix 9 43mm on none

On the makers’ published figures, the Garmin Venu 4 45mm wins on battery life (maker's claim) (288 h against 240 h). 2 gaps are borderline, differences most people would not notice: case size (43 mm against 45 mm) and weight (case only) (38 g against 44 g) for the Garmin Venu 4 45mm. The other 9 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 43mmGarmin Venu 4 45mm
Case size
43mmOfficial
45mmOfficial

Marginal — most people won’t notice.

Case shapeSame.
roundOfficial
roundOfficial
Weight (case only)
44gOfficial
38gOfficial

Marginal — most people won’t notice.

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

Display

SpecificationGarmin fēnix 9 43mmGarmin Venu 4 45mm
Display typeDiffers, but not ranked.
AMOLEDOfficial
Bright colour displayOfficial
Display sizeDiffers, but not ranked.
1.3inOfficial
1.4inOfficial

Battery

SpecificationGarmin fēnix 9 43mmGarmin Venu 4 45mm
Battery life (maker's claim)
10 days (240 h)hOfficial
12 days (288 h)hOfficialwins this row

Garmin Venu 4 45mm is ahead here, by a gap you’d notice.

Health

SpecificationGarmin fēnix 9 43mmGarmin Venu 4 45mm
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
GPSDiffers, but not ranked.
GPSOfficial
Multi-band GPSOfficial

Connectivity

SpecificationGarmin fēnix 9 43mmGarmin Venu 4 45mm
Cellular modelSame.
NoOfficial
NoOfficial

Compatibility

SpecificationGarmin fēnix 9 43mmGarmin Venu 4 45mm
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.