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

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Thanks!. I'm not an apple person but love my garmin vivoactive 2, 10 years old and going strong. I can get notifications but can't respond. I'll look into the venu 3 later this year.
I wear the discontinued Garmin Vivoactive HR (https://www.garmin.com/en-US/p/538374/) with a screen protector over it. (Broke the screen of my first one mowing or weedeating when I threw a rock up) It's pretty resilient otherwise and can get wet with no extra attention needed. I've used it swimming, etc. My only complaint is that when pumping chest, I tend to hit a combination of buttons that enters me into recording some sort of workout (so it's buzzing at me). Battery isn't what it used to be (it's years old!), but it lasts a week or more. (Off duty, I wear an old Apple Watch Series 6 that I'm not comfortable wearing on duty. I can't even get 20 hours without recharging.)
I flip back and forth every now and then. First Garmin was a vivoactive hr. Then Apple Watch s3 Then back to Garmin with a Vivoactive 3, back to Apple Watch s5, Fenix 6 pro, Epix then Epix pro. Currently wearing aw s10, other than for kayaking. Apple Watches are getting better and better, buttons and battery are the only major benefits for me, and with an Epix battery isn’t that much better. Training info in the Garmin app is better too but the gap is closing, and subscription apps are probably even better. Bevel is great but a bit spendy. I think I’ll probably always have at least one of each now, eying up an aw ultra 3 next, Fenix line is getting too expensive now.
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 vivioactive was my first move from Fitbit it does the heartrate exercise tracking stuff, I did move to a more expensive Garmin because I like the GPS for golf, hiking, and cycling. Look for discount codes offered by healthcare providers, I used to get a 30-40% off from Manulife every year or two.
Garmin. You could go for a venu or vivoactive which are in that crossroad between smart watch and fitness watch. More fitness features than a smart watch and more smart features than a fitness watch. Also looks a little more elegant on your wrist. Trade off is of course if you’re getting serious that there are features that has been sacrificed for more smart features
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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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