Left, I like being odd.
It is annoying for my teachers, when the person next to me complains about me writing with my left hand.
The teachers move me, and 5 minutes later Im writing with my right hand.
This is probably common but I can do most tasks with my left hand. The only thing I can't do is write with it. So if my right hand is busy I can still manage with my left, no problem. Comes in handy if I'm writing and I need to do computer work with my left hand (in which case I move my mouse to the other side, but I don't set the left and right clickers in reverse.) Again, I think it's common.