I have been really happy with the Garmin Fenix. It has an "exercise load" feature which I've found a lot more useful than "exercise minutes" (which Garmin also

I have been really happy with the Garmin Fenix. It has an "exercise load" feature which I've found a lot more useful than "exercise minutes" (which Garmin also collects.) Exercise load uses some sort of a dynamic scale that weights time based on how long you spend in the heavier heart rate zones. Walking on level ground pretty much never counts for "exercise load" since my HR stays under 130, but hills/running/biking can get up to 140+ where I get exercise load points. A slightly clunky thing with the Fenix is that you have to explicitly tell it you're doing an activity to get some metrics - but the heart rate/step count/calorie data is always being gathered. And the Fenix has at a minimum twice the battery life of an Apple Watch, and keeping it in no-GPS mode lets it extend to weeks of battery life while still gathering most of the key metrics.