Overall, well done
The artwork was above-par, and I'm thankful I didn't see any sprites.
My only real criticism is that the move is entitiled "Byakugan VS Sharingan," as such, you should focus on those two aspects. The only time either one was used (Byakugan) was when Neji did his 64-palm strike, and even that was sub-par. Next time, I suggest you devise a thorough understanding of how to manipulate both aspects of the parties abilities.
As an earlier review said, it wouldn't be such a bad idea to enable a user-choose-victor option.
On a more personal option, I like Neji more, but I feel Sasuke has more potential.