Really hope this actually does happen although logic would suggest it doesn't. The best hope is that one of them, likely Musk, throws out a comment that really gets under the skin of the other and so emotions come to the fore and it becomes super-personal and a matter of pride rather than an escalated lark
As to who would win, size would indicate Elon but something about Zuck and his autistic inner robotic rage makes me think he simply would not let himself lose, whereas Musk could just easily laugh it off and move on with his day and life and not be bothered too much
