Garmin
Forerunner 245 Music

Garmin
Garmin

Garmin

I am also using an AMOLED (epix pro gen 2), which replaced a fr245. I had a tough time in some scenarios with the MIPS display, such as on shaded trails and around subset (both common in my users). In these cases I am happier with the AMOLED.
A few months ago I made the transition from the FR245 to the Epix Pro Gen 2 Sapphire and have been enjoying the change, I especially like the larger and brighter screen. I hope you have a great time with the new watch!
I usually wear both a watch and a fitness tracker. For the watch, it is usually a Seiko SKX007 or a Citizen Eco-Drive Promaster. For the fitness tracker, I wore a Garmin Forerunner 245 for several years, and a few months ago, I purchased an Epix Pro Gen 2 Sapphire (47m).
The first one i broke rock climbing. 245 i replaced with 255 bcs i started trail running and i wanted elevation tracking. 255 was the reasonable choice (price vs function) even though I liked fenix 7 more
FR245 still live and kicking
Before jumping into another brand, you might check out the WorkOutDoors app and see if it helps you step up your training a bit: https://apps.apple.com/us/app/workoutdoors/id1241909999 Disclaimer: I don’t use an Apple Watch myself (Garmin Forerunner 245 here), but I have running buddies that do and they swear by WorkOutDoors. It has a similar workout builder to Garmin, every data screen you could imagine and more metrics than you could shake a stick at. Everything should sync up between Apple Health and Strava/Runalyze/TrainingPeaks/whatever sinks your submarine.
My FR245 has lasted almost 10 years. Beat the shit out of it and still going. Can't beat that imo. Looking at a slight upgrade to FR255 to keep the MIP
I see a lot of people recommending the Forerunners, I own a 245 and it's great but keep in mind that it sucks at tracking you with the GPS while open water swimming. I don't know if that's something that happens with every smartwatch but it's something you probably would like to know. For everything else? Absolutely great and I've had pretty much 0 issues in 2 years of using it.
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.

Ranked #1
Oura - Oura Ring Series

Ranked #1
Apple - Ultra Series

Ranked #1
Garmin - Enduro 3

Ranked #1
Garmin - Fenix 7 Series

Ranked #1
Garmin - Forerunner 255 Series

Ranked #1
Oura - Oura Ring Series