For the sake of completeness, I would also mention:
- Suunto (20 to 30 days in smartwatch mode for the Verticals, optional solar charging, flashlight on the Vertical 2)
- Coros (2 to 3 weeks depending on the model), no flashlight
- Withings (30 days, looks like a regular watch)
Coros is good for how long they support their watches, and the fact that they don't restrict features in lesser models. Suunto is great for route planning. Polar is renowned for its training metrics (sleep, recovery etc.) but only fetches a week in smartwatch mode.
- Suunto (20 to 30 days in smartwatch mode for the Verticals, optional solar charging, flashlight on the Vertical 2)
- Coros (2 to 3 weeks depending on the model), no flashlight
- Withings (30 days, looks like a regular watch)
Coros is good for how long they support their watches, and the fact that they don't restrict features in lesser models. Suunto is great for route planning. Polar is renowned for its training metrics (sleep, recovery etc.) but only fetches a week in smartwatch mode.