Garmin
Forerunner 255 Series
Long battery, but wrist HR often inaccurate.
Running these analyses costs money. Buy through my links to help keep lights on! I may get a small commission.
I am using an Amazfit trex 2 since last 3 years and it's an amazing value for money smart watch. You can check out accuracy comparison videos for this with garmin, whoop or apple watch on YouTube. Its a common consensus in fitness community that it delivers good value at the price point. Amazfit has recently launched the next version of t rex 3 pro which is an amazing watch too. I have recently heard very good reviews about hart ring by fittr in my network too.
The watch so many people have no idea exists, is the Amazfit T-Rex 2 or 3. I prefer the 2 as the size is perfect but the 3 is larger. These watches can do it all and have a battery life on a single charge of 27-30 days. Yes, it tracks your health, phone calls and messages etc. You name it, it can do it. I was dead set on Garmins top watch and stumbled on the Trex at Best buy by accident. Saw it was a couple hundred bucks and can't find anything like it for the price. Link, https://us.amazfit.com/products/amazfit-t-rex-3?srsltid=AfmBOop_QFFZAqxYEbadiSkjE18Be4yPUUNQ1yQYy1i70QuodQiDMxmI
I had the T rex 2 and I loved it! Such a good watch for the price. 3 will definitely be worth it
Can't walk right now due to a broken toe, but I use an Amazon T-Rex 2 watch with the android Zepp app for walking
I've had 3 different Samsungs, 2 Pixel, a One Plus 3, an Amazfit T-Rex 2 and a Nothing. I'm going back to an Amazfit Active Max. The name brand ones I've had just don't work for me like the Amazfits do. They just work. Otherwise, I like smartwatches just for the tinker with factor...
No need to read these reviews. If you want real world tests of smart watches there are only 2 channels you need to watch to form an opinion i.e The Qualified Scientist and Chase the Summit. In saying that I still use my Trex 2 and still working great for my needs.
Garmin
Forerunner 255 Series
Long battery, but wrist HR often inaccurate.

Garmin
Forerunner 955 Series
Endurance battery, value king, but clunky UI.

Garmin
Fenix 7 Series
Rugged, long battery, maps, but HR and software can struggle.

Garmin
Enduro 3
Unrivaled multi-week battery, solar-charged, but bulky.

Garmin
Forerunner 965
Lightweight, vibrant AMOLED, maps, but wrist HR and swim issues.

Ranked #1
Oura - Oura Ring Series

Ranked #1
Apple - Ultra Series

Ranked #1
Garmin - Fenix 7 Series

Ranked #1
Garmin - Fenix 7 Series

Ranked #1
Garmin - Forerunner 255 Series

Ranked #1
Oura - Oura Ring Series