Garmin
Forerunner 255 Series
Long battery; but wrist HR tracking is inconsistent.
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Huawei GT3 Pro. Battery life is stellar... Though it's over three years old now and probably time for a change. Super watch.
Went from my gt 3 pro to gt 6 pro, a big update in features. But the sleep sensor is still quite unreliable as in the gt 3 pro, but i came to find out this is the case with most smart watches except a few specialising in that field. A great overall everyday premium watch.
Apple watch and at times huawei GT3 pro...
I've had a Pebble, a Samsung S3 Frontier, a Huawei GT3 Pro and now a Pixel Watch 2. I doubt I will ever switch from Pixel watches, they are integrated so perfectly into the ecosystem.
I just got the regular GT 3 about 2 weeks ago and the sleep tracking is so hit or miss. One morning it said my bedtime was 2:30, but I was constantly getting in and out of bed until 3:50, so I definitely wasn't asleep. Other nights it seems pretty bang on
I have a Huawei GT3 and a Galaxy S21FE, and it works perfectly. You download Huawei Health from the Samsung app store. And it works very well. I mainly use it for swimming, but I do miss the kick function.
Garmin
Forerunner 255 Series
Long battery; but wrist HR tracking is inconsistent.

Garmin
Forerunner 955 Series
Best value, clear MIP screen; limited smartwatch features.

Garmin
Fenix 7 Series
Durable, multi-week battery, flashlight; high price, buggy software.
Garmin
Instinct 2 Series
Rugged, solar multi-week battery; bulky, small screen readability issues.

Garmin
Enduro 3
Multi-week solar battery, lightweight; but bulky form factor.

Ranked #1
Oura - Oura Ring Series

Ranked #1
Apple - Ultra Series

Ranked #1
Garmin - Enduro 3

Ranked #1
Garmin - Fenix 7 Series

Ranked #1
Garmin - Forerunner 255 Series

Ranked #1
Oura - Oura Ring Series