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

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No shit. I had no issues with any of the three. My EPIX PRO 2 was discounted so your comment explains why I got it cheap but I thought the discount was due to nearing end of life. I've used all three and track 2-3 workout events a day, steps and sleep. I never had an issue with any of them. Fenix 5S sapphire, Fenix 7S, sapphire/solar, Epix Pro 2.
Or Fenix 8, 43mm. Maps are awesome. I had a Fenix 7S but my last one is an Epix Pro 42mm. Fenix battery is far superior but the Epix screen is much easier to see.
Garmin Fenix 7 (with or without solar charging)... They are VERY affordable now (since the Fenix 8 came out last year)... They do A LOT while standing up to hard environments
I would agree with the other post, if you want to get into tris, garmin is your best bet. The cool thing is, while the top of the line models are expensive, a couple of generations older are still awesome. My recommendation would be for a Fenix 7. Running about $450 on amazon new. [https://amzn.to/49DghWh](https://amzn.to/49DghWh) If that is a bit too pricy, you might try the Instinct 2 or 3. I have (and use) an instinct 2, that is very rugged and currently only $215 on amazon: [https://amzn.to/489fVUD](https://amzn.to/489fVUD)
Fenix 7 (non-pro) has the gen4 optical HR sensor, vs gen5 on the Fenix 8 In fact I'd be careful about which version of the 7 you get. Try and get the one with dual-frequency/multi-band GPS.
I've used the Garmin Fenix 7 Solar (51mm) for 3 or 100 milers. One of them lasted 38 hours and I still had 15% battery life, it something like. With it being the previous generation it's much cheaper now too. Even now I think it's still a solid purchase.
I’ve an OG fénix 7, tempted with AWU and hand-held GPS for long days on the hills. Can probably get both for less than a newer fénix.
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

Ranked #1
Garmin - Forerunner 255 Series

Ranked #1
Oura - Oura Ring Series