Garmin
Forerunner 255 Series
Long battery; but wrist HR tracking is inconsistent.

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Garmin Venu 1, 2, or even one of the newer Vivoactives would be great. You can get a Venu 2 for probably about $100-$130 on Facebook Marketplace right now. You can also get one of the older Garmin Forerunners for about the same price as well, if not a little cheaper
I have a Venu 2 and mostly do peloton cycling and yoga/strenght classes. Finally we have some basic integration and can only dream that one day garmin would release a garmin watch for peloton users (seems more useful than the marvel watches). In the meantime should I consider upgrading to the venu 4 for better sleep and health metrics?
I'm 5'2'' I have the Venu2S and it's a perfect size for my small wrists. This is a feat considering every round smart watch I've used so far has had both a strap that was too long, and a watch body that was too large. It comes in a gold and rose gold model, as well as a cream and black option, and is quite inexpensive as far as Garmins come. It supports vo2 max but not lactate threshold (but that can also be calculated manually or using an online calculator by plugging in the run data from your watch).
Not lactate metrics but it does have vo2max. I can see it on my garmin connect app.
My hulking brother rocks my original Venu which comes in-between at 43mm. I didn't really notice a size difference when I moved into the S models for 2 and 3. Initially it was a pain because the straps went from 20 to 18mm. They have an all black 41mm. I'm waiting for the gold/bone one to ship. I don't really care about the straps as I swap them for nylon ones ASAP anyway.
I'm getting a Venu 4. It's 20 bucks less than the 570, and from what I can see, it's missing swim drills, which is something I don't use now. I also like the look of the Venu over the 570, though I wish Garmin would bring back copper/rose gold bezels/cases. I really liked that colour on my original Venu.
my venu 2, after 3 years of us,e still gets 4 days
I moved to a Garmin Venu 2 a few years ago after using a Fitbit for a while. The Venu series is an excellent general fitness tracker that still has more features than my Fitbit did, without the huge price tag and *probably* un-needed features of some of the top-end Garmins.
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.

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Oura - Oura Ring Series

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Apple - Ultra Series

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Garmin - Enduro 3

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Garmin - Fenix 7 Series

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Garmin - Forerunner 255 Series

Ranked #1
Oura - Oura Ring Series