> The Coros watches are less than half the price, have 22 days of battery life in smartwatch mode

Garmin gets almost 30% more battery life in exchange of not being as fast (30 days)

> I think you can only reach Garmin's stated time if you disable a lot of functionality.

Turning off always-on Pulse ox gets you there. Turning everything off except telling time gets you 2.5x the battery life (69-71 days)