Garmin
Forerunner 255 Series
Long battery; but wrist HR tracking is inconsistent.
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How did you connect your HR to your watch? I can’t get it to work- I have Garmin 230. Maybe it’s too old?!?!
Fenix 7pro solar. Love it, its functions and battery life! I hope it lives as long as the one it replaced (FR230, which is still working after 8 years of use!)
My first Garmin was the Forerunner 10 back when I first started running and before “smartwatches” were a thing! From there, I had the Forerunner 230, Fenix 5s (was way overkill for what I needed and it was confusing to use), Vivoactive 4s, Venu 2SQ and I currently have the Venu 3s. I upgrade every couple of years and buy them directly from Garmin’s website. They have a side by side comparison tool which is very helpful when you are trying to decide between watches.
If you are very big into running metrics, then you would want a Forerunner. If not, then the Vivoactive series is a great all around fitness watch. It does work well with an iphone. You will not need to connect to Apple Health as Garmin has its own app that will track your health stats and it syncs with the watch. The important thing to know coming from an Apple Watch is that Garmin watches are fitness watches first so you won’t be able to text through it or make calls (unless you get a watch that has a speaker and mic and has this specific feature, like the Venu 3 or 4). You will be very happy with the battery life though!
If they won't want to charge it daily, a Garmin is a great option. The next question is whether they will go through and select specific activities when they do them (hike, golf, cycling, etc). If so, then go to the Garmin website and confirm which model has what you want. If not, then it really doesn't matter as they'll be using the basic background activity tracking features. The Forerunners in the 200 series are good values with most activities, but maybe not golf.
I gave in. Found a forerunner 2nd hand at a steal. Zero regrets, wouldn't go back to polar (after using them 7 years)
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
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

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Oura - Oura Ring Series