Apple Watch Series 10 (46 mm, GPS, aluminium) / Samsung Galaxy Watch5 Pro 45 mm

The aluminium version uses Ion-X glass; the titanium versions have sapphire crystal.

Up to 2000 nits and down to 1 nit. Apple says the wide-angle OLED looks up to 40% brighter when viewed at an angle, making the watch easier to read without raising the wrist.

Sapphire crystal resists scratches better than mineral and aluminosilicate glass; the raised bezel around the screen protects the glass from knocks.

The electrical sensor enables ECG recordings and the optical sensor continuous heart rate. Availability of health features varies by country.

Suitable for shallow-water activities such as swimming, not for scuba diving or high-velocity water sports. The depth gauge is for snorkelling down to 6 metres.

This version has no cellular connection, so calls and data away from the phone need Wi-Fi. Location uses only the L1 band; there is no dual-frequency GPS.

Fast charging uses the included magnetic fast charger to USB-C cable; the adapter is sold separately.

Samsung says the battery is 60% larger than the Galaxy Watch4’s.

An iPhone is required for setup and use; it does not work with Android phones.

The D-Buckle band uses a folding clasp so the strap sits at the same point every time, in place of a standard pin buckle.

Wear OS 3 and later do not work with iPhone. Blood pressure and ECG work only in markets supported by Samsung Health Monitor and with Galaxy phones.

Bioelectrical impedance analysis estimates values such as body fat and skeletal muscle; results are not for medical diagnosis.

Track Back follows the recorded path in reverse to help you return to the start.

5ATM covers surface water activities such as swimming, not diving or high-pressure water. MIL-STD-810H is a set of military test methods, not a guarantee of impact resistance.