Board Thread:Boruto Discussions/@comment-33255203-20171004210031/@comment-6769189-20171011102851

Neji's use was was considered abnormal/high and his feats are way below what Sasuke was capable of around the same time. We have seen the upper limits of the Byakugan.

Like you said, Sharingan is the better combat eye. In a fight of a Sharingan user of similar level takes the win. Short of elemental Kekkei Genkai, a Byakugan user won't be able to do much.