1. Battery life (earbuds + case)
Look at playtime per charge (4-6 hours is typical) and total playtime with the case (20+ hours is a good target).
2. Fit and seal
A good seal matters more than a spec sheet for sound quality. Check if multiple ear tip sizes are included.
3. Connection stability
Bluetooth 5.0 or newer generally means fewer dropouts.
4. Water resistance
An IPX4 rating or better handles sweat and light rain.
5. Controls
Touch controls on the stem or shell save you from pulling your phone out constantly.