byakugan would own sharingan (assuming) hehe. we havnt seen the true power from a dude with byakugan show up yet so it hard to decide, maybe they got there own mangekyou genjutsu of there own. but then the sharingan can still anticpate the oppenents move, but what if sharingan user get poked on a point where they cant bring chakra to there eyes, hard to say =).. but it would defintly be a pay per view fight .. neji vs sasuke when there older .. good game