The byakugan is MUCH better in my opinion, because although the sharingan has its share of great abilities, you should be able to see the difference. The Sharingan gives you the ability of copying any move, but the Byakugan lets you see through genjutsu, see almost 360, see all the tenketsu and hit them, and geniuses like Neji can use the Hakkeshou Kaiten (divination whirl) to an even greater advantage.Also, the Byakugan user can read what ppl are thinking by the movement of their eyes.(ep.46) The Sharingan can't copy the Hyuuga moves cause the Hakkeshou Kaiten and 64 hands of hakke are part of the hyuuga bloodline limit. The Sharingan has the ability to use very powerful genjutsu, and hypnotize the guy....and see thru Kage Bunshins too, which the Byakugan can't (as explained in Naruto ep. 60, around 16 mins and 43 secs). But i dunno, the byakugan is better in my opinion. besides, kakashi said so too.