well actually i would have to vote for mange sharingan. it only takes 1 pair of eyes to own everyone else. the byakugan has a 360 degrees view, so it makes it almost impossible to escape the mange sharingan. thus, sharingan wins. BUT if force, then byakugan would win with all its taijutsu techniques, and damn 10 kaitens at once is pretty wicked. Imagine naruto learning it, i bet you he could spin forever. =P