Apple

I use mine for more than I thought I would, but it took me some time to set up.

1. Fitness. But not on a level of going to a gym. On the level of making a game to close my rings, especially that damn green one, every day. This comes from my doc saying I need to get out and moving to improve my heart health. It's worked, turning it into a game. I try to add to the goal every quarter. dropped over 90 pounds this year just because of this and a diet change of restricting salt to 1500 mg / day.
2. WorkOutDoors - this is what I use to track the walks, bike rides, hikes and elliptical exercises I do. Takes some dedicated time to set up the screens with the data you want shown, but after that, it is the best out there. No sub, just small buy-in price.
3. Authenticators - Everything is going this route, so I have all my authenticators set up for work and play to notify me on the watch. With AWU2 with cellular I dont even need the phone for most. some still do because there isnt a dedicated app. Too many to list, but MS Authenticator and OKTA are the 2 I use most.
4. Weather - I used to have Carrot, but once the WatchOS was updated and the built-in weather app started behaving correctly, I canceled the sub. So far, it's been fine and accurate. I use it to determine what I wear in the morning (jackets/coats) and if I am going to walk or hike or stay in and do my elliptical that afternoon.
5. Messages - started out only reading them, then responding to them on my phone. But now, with the enhanced dictation, I respond on the watch unless I want to send media.
6. Music and Books - Apple Music, YouTube Music and Audible are great. On my hikes, walks and bike rides, I leave the phone at home. So far, all are working great. YTMusic and Apple Music stream, I download the books 1 at a time in Audible. Works great with AirPods.
7. I track my water intake as my doc wants me to only drink so much in a day (128 oz). On the phone I also watch the sodium and come January as a new goal, I am going to start really keeping track of carbs to try and drop a bit more this coming year.
8. I can tell the time. Funny how that can get left off lists, but it is a watch.
9. A few cool complications and widgets come from different apps, but I dont really get into those on a daily basis. Lumy, Fantastical, Sundial, Heart Analyzer are the ones off the top of my head.
10. I use MyQ to open my garage when I get home from walking or biking. dont have a keypad anymore and dont want to stash an opener somewhere.