I’ve been told since childhood that men wear watches on the left wrist and women on the right, so I’ve always worn my watches on the left wrist. That said, I’m a lefty, but as I’ve always hated needing special products for lefties, I’ve trained myself to do everything better with my right hand, so I don’t bang my watch. The only traces of left handedness on me are writing with my left hand and that rings and watches just feel better on my left hand/wrist.