I always wear a watch, why not make it one that has a depth gauge and a timer on it?
I wont need to take it off and risk misplacing it or having it stolen while swimming or diving, I wont have to abort the dive just because the computer dies. In fact, I wont really even need to bring or rent a computer..
Then again, Im a man.. I dont spend loads of money on jewelery, so why not just get a nice watch when I need a new one anyways?
Btw, I wouldnt even consider getting a "diving watch" without a depth gauge on it, but thats just me..