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Head to head

Garmin Garmin fēnix 9 51mmvsSamsung Galaxy Watch Ultra2 47mm

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
2026-08-07Samsung Newsroom UK — Galaxy Watch Ultra2 and Watch9, retrieved 2026-09-13
Price
£649Samsung Newsroom UK — Galaxy Watch Ultra2 and Watch9, retrieved 2026-09-22
Security updates until
Not published by the makerSamsung UK — How to update software on Galaxy Watch, retrieved 2026-09-13

1 win for Garmin fēnix 9 51mm0 wins for Galaxy Watch Ultra2 47mm1 difference you won’t notice£300.99 apart at RRP

Verdict: Garmin fēnix 9 51mm ahead on 1 row, Galaxy Watch Ultra2 47mm on none

On the makers’ published figures, the Garmin fēnix 9 51mm wins on battery life (maker's claim) (696 h against 80 h). The difference in weight (case only) is below the threshold you would notice. The other 28 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 51mmSamsung Galaxy Watch Ultra2 47mm
Dimensions
No verified data
47.4 x 47.1 x 10.7 mmOfficial
Case size
51mmOfficial
47mmOfficial
Case shapeSame.
roundOfficial
roundOfficial
Weight (case only)
65gOfficial
61.5gOfficial

You won’t notice this difference.

Case material
No verified data
TitaniumOfficial
Water ratingDiffers, but not ranked.
10 ATM; 4 ATM Dive (EN 13319)Official
10 ATM, IP69K, MIL-STD-810H, EN13319Official

Display

SpecificationGarmin fēnix 9 51mmSamsung Galaxy Watch Ultra2 47mm
Display typeDiffers, but not ranked.
AMOLEDOfficial
Super AMOLED, Full Colour Always On DisplayOfficial
Display sizeDiffers, but not ranked.
1.4inOfficial
1.52inOfficial
Resolution
No verified data
498 x 498Official
Peak brightness
No verified data
5000nitsOfficial
Always-on display
No verified data
YesOfficial

Platform

SpecificationGarmin fēnix 9 51mmSamsung Galaxy Watch Ultra2 47mm
Operating system
No verified data
Wear OS 7Official
Chip
No verified data
Qualcomm SDW6100 (Snapdragon Wear Elite, 3nm, 5 core)Official
Storage
No verified data
64GBOfficial
RAM
No verified data
2GB3rd party

Battery

SpecificationGarmin fēnix 9 51mmSamsung Galaxy Watch Ultra2 47mm
Battery life (maker's claim)
29 days (696 h)hOfficialwins this row
80hOfficial

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

Battery capacity
No verified data
800mAh3rd party
Charging
No verified data
Fast Charging, up to 40% in around 30 minutesOfficial

Health

SpecificationGarmin fēnix 9 51mmSamsung Galaxy Watch Ultra2 47mm
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
Accelerometer, Barometer, Bioelectrical Impedance Analysis Sensor, Electrical Heart Sensor, Gyro Sensor, Geomagnetic Sensor, Light Sensor, Optical Heart Rate Sensor, Temperature SensorOfficial
ECG
No verified data
YesOfficial
Skin temperature
No verified data
YesOfficial
GPSDiffers, but not ranked.
GPSOfficial
L1+L5 Dual-Frequency GPS (GPS, Glonass, Beidou, Galileo, QZSS)Official

Connectivity

SpecificationGarmin fēnix 9 51mmSamsung Galaxy Watch Ultra2 47mm
Cellular modelDiffers, but not ranked.
NoOfficial
YesOfficial
Cellular model price
No verified data
£649Official
UK networks with eSIM
No verified data
EE, Vodafone3rd party
Wi-Fi
No verified data
802.11a/b/g/n 2.4GHz+5GHzOfficial
Bluetooth
No verified data
6.0Official
NFC payments
No verified data
YesOfficial

Compatibility

SpecificationGarmin fēnix 9 51mmSamsung Galaxy Watch Ultra2 47mm
Works withDiffers, but not ranked.
Compatible with iPhone and AndroidOfficial
Android 13.0 or higher and with more than 1.5GB of memoryOfficial
CompatibilityDiffers, but not ranked.
iPhone and AndroidOfficial
Android; some features need a Samsung phoneOfficial
5 attributes neither watch has a sourced figure for

Strap width · Display area · Charge to 80% · Blood oxygen · Blood pressure. 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.