Garmin
Forerunner 255 Series
Long battery; but wrist HR tracking is inconsistent.
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I haven't used Coros for Hyrox, but do use it for running and it's fantastic. +1 on the above!
My apple watch series 8 lasts for a whole marathon without issues That said if you want much more battery life, coros pace should do it
I like my Coros Pace. Fantastic battery life is a killer feature.
Runner? Get yourself a Coros Pace.
The Coros Pace. I’ve had the 2 for 3 years and the battery life is still amazing. The 3 is even better apparently. Great value watch.
My friends and I have recently all got Coros Pace watches and they're really great!
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