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
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)
Depends on what you need, if it’s mainly for running, I’d go with one of the cheaper Forerunner models. An AMOLED display is a nice upgrade though. Also, definitely check the battery life if that’s important to you. I recently switched to the 965 and can say it’s been a solid watch.
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