Check phone compatibility first
Some watches work only with one phone platform. Confirm that the watch, the health features and the messaging apps work with the phone you own.
Cellular is a separate plan
A cellular watch needs a mobile plan and may carry an activation fee. If you always carry your phone, the cellular premium may not be worth it.
Sensors and subscriptions
ECG, blood-oxygen, sleep and fitness features may require a subscription or a specific region. Check what is included and what is paywalled.
Battery and charging
Battery life depends on the display, always-on mode, GPS and sleep tracking. A watch that lasts one day needs a daily charging routine.
Size, band and comfort
Case size and band material change how the watch feels. Try it on and check whether the band is standard or proprietary.