I’ve never had an Apple Watch and don’t know the difference between the various models, I’d like one that can have multiple timers going at once, temperature/weather feature, sleep tracker, step tracker, ability to send texts, gps, waterproof and a screen that doesn’t have to be stuck on, what is the oldest model that has all these functions?
Probably series 7. I believe that was the first that offered water resistance to allow for at least swimming. It is why I upgraded from my original AW to the AW7.