I know that it's a personal thing, but you might end up with a disappointing experience if you try to 2-in-1 at a low cost.
I like the garmin ecosystem for fitness tracking (and my next watch will likely be a Venu 3 if / when), but tbh it's pretty meh as a smart watch. It's really about the fitness aspect.
Fitbit might give you a better experience. It's more lifestyle oriented and will give a better casual overall experience. Maybe try for a Fitbit Sense or Sense 2 if it fits the budget?