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

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I recently switched from a Coros Pace 2 to a Garmin Fenix 7 Pro Saphire Solar and absolutely love it. Feels much more substantial than the Coros and battery life is awesome. The Coros battery life had severely degraded over the last 6 months.
do you like hiking at all? The fenix series as well as the Forerunner 965 IIRC have some pretty awesome integrations with AllTrails...I'm also a huge proponent of buying used on Facebook...it takes some research, but the used market is solid for these devices and a great way to start...I've bought 6 watches(family of 4) only one was new(fenix 7 pro saphire titanium) as it was a great new price during some sort of seasonal sale... :) I couldn't recommend the garmins more over any apple or fitbit devices...tjeu are great watches and battery life measured in days instead of hours is a luxury you will also appreciate....On my fenix 7, I love the flash light...totally unexpected top 3 feature. :)
i sleep with it everyday (47mm). dont really notice, but i swapped out original silicone band with nylon band on day one
Had a 265, moved to a 47mm Fenix 7 Pro because I wanted full mapping since I started trail running and MIP display and didn't care about potential new features. Yes, the Fenix units weigh more, but a good chunk of that weight comes from the stock chonky silicone straps. The difference between case-only on my kitchen scale was \~10-13g if I remember correctly. When running, I definitely noticed the additional swing weight on my wrist with the F7 on stock silicone, but don't really notice it now that I have it on a nylon band.
If you are on a budget the two best options IMO are fenix 7 pro ss with MIP or epix pro gen 2 with AMOLED. I just went fenix 6 standard to epix pro gen 2. It is definitely nicer. But not a game changer. Fenix 6 pace pro and garmin training plans for running. Do you have maps, garmin pay, and training plans on the 5?
Love my mip Garmin Fenix 7 pro ss. Black Friday is coming up, if you can hold off, there should be really good deals to be had then. That’s when I got mine last year. Battery life is twos, if I run/workout everyday. If I don’t it can easily for longer. I came to Garmin from a regular AW. It had to be charged twice a day if I worked out and wanted to track my sleep. I much prefer the mip to the AW amoled screen.
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