I feel naked without a watch so I use an old Timex Explorer as my 'beater' for stuff like hunting, diving, skiing, running etc. I've had it since I was 11 and it survived all through secondary school plus a load of fairly rough treatment for hiking, sky diving, scuba diving, a motorcycle accident, rugby, sailing, festivals, hunting, cadets etc so I'm confident in it's durability. I'd be sad, but not devastated if it got lost or broken so I don't have to think about it if I'm crawling around in the dirty or scratching it up.
For daily wear I mostly gravitate towards my Omega Seamaster Planet Ocean. Still pretty bombproof, but I would be sad to see it break, so it mostly goes to the office, on drives and out and about on the town and sees nothing more strenuous than a swim or a walk. I have scuba dived with it a bit though, kinda seems a shame not to if you've got it. I have a couple of other pieces that fill a similar role, but the Omega gets the nod more often than not.