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

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I am happy with my Garmin Descent G1. I use it for freediving, SCUBA, hiking, running, cycling, walking and other shenanigans. I have only used it for Air in SCUBA. Others might disagree with me but I would still have a dedicated dive computer aside from a smartwatch. For SCUBA purposes, I mainly use my Descent G1 for logging purposes and surface navigation. There is the newer Descent G2 now but it comes with a OLED screen which I dont like because battery life is shorter and it blinds me at night.
I have the G1. My wife has the G2 and loves it.
You can get a new Garmin Descent G1 for like $400, maybe less. Great dive watch overall.
Even though I tend to agree to some extent, I've been using a Garmin descent G1 for a couple of months now and I'm super happy with it. I work at a dive centre so I dive every day and it has been very reliable. It feels more like a dive computer that ends up working as an activity tracker rather than the other way around.
I work at a dive centre so I dive every day, so I was looking for a computer that could double as a smart watch as I'm used to having one and that way I wouldn't have to switch between the two every day. I got a Garmin descent G1 a couple of months ago and I'm super happy with it. It feels more like a diving computer that you can use as a smart watch rather than the other way around, and I got it for 400€, which was a steal for all of the features it has.
It's still around, I just saw them for sale yesterday. Try Amazon.
I like mine a lot, was looking for a second (redundant). Good sales happen in November if you can wait!
Yippp been wearing the G1 solar for 4yrs now. Scuba, apnea hunt, swimming, and running, garmin has me for life hahaha Also the golf app is awesome and free. It learns overtime.
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

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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