Garmin
Forerunner 255 Series
Long battery; but wrist HR tracking is inconsistent.
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I have a garmin epix pro gen 2 and a galaxy watch ultra , in past have a fee apple watch and galaxy watches and some old garming for runner 405 cx and for me the the epix for example is sturdy it look great the titanium band is awesome it have a LED light(not using the screen) the gps is precise(at least for what i need) the battery last a lot and that why it keep me plus it looks good and feel more a watch and multitool than an extension of the smart watch, not saying apple watches and samsing watches are trash but for me they still have long way to go and garmin basically would need to add a good lte and ability to add the esim and it will be perfect (for me obviously)
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
Use forerunner for swimming and it works great. So happy I no longer have to count my laps and I can just swim.
if he is working a lot in the rain, get him something with more than 2 buttons so he would be able to use the watch using only the buttons (without the touchsreen) if he needs to, something like a forerunner, or instinct (doesnt have a touch screen) or a fenix (but a fenix is one of the more expensive ones)
Dito. Venu will offer a tick “sexier” display due to oled, FR will most probably go longer. Might be a case for weekend hike ;)
I have a Fenix 7 Solar because I bought a 6 Pro Solar really cheap when they were discontinued but it broke and Garmin sent me a 7 as a replacement under warranty. However the Fenix models are generally more than I feel I’d want to pay unless they are end of line so if I needed another I’d get a Forerunner that has the functions I actually use (Fenix, for example, has gold stuff. I will never play golf)
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