no one won.
ross is a cartoon character. i don't mean that as an insult either: the man's ability to bounce back from what should be fatal career wounds is wile e. coyote-esque. and he did have his moments against 50. that said... how you gonna claim a W when your people are getting thrown through barricades + getting jewelry relieved (among other things)?
50 didn't win, because he finally ran into someone he can't bully into submission. even if/when he was actually winning, ross just coming back for more like nothing happened. i dont know if you can beat someone like ross, because he'll literally just turn around and say "i won" anyway. what's the point?
the only way to "win" is for them to leave each other alone imo. but they're both too stubborn + petty for that.