I think in terms of ranking inside Konoha the Hyuuga clan has more prestige, but there are a few factors that are making Sasuke's match more important then Neji's. One is that the Uchiha clan was all but wiped out, so Sasuke being the survivor of the massacre makes him very important, save for him his brother and Kakashi there don't seem to be any other sharingans floating around out there. Also while Neji does seem to be very strong and from the Hyuuga, he's technically from the branch family which means people look at that first and not his actual power. Personally I think Neji could take Sasuke, but I have yet to see what Sasuke can do with his new month's worth of training. Anyhoo, I think it basically comes down to the fact that Sasuke is the survivor of a wiped out clan. He's a rarity whereas there are plenty of Hyuuga kids running around out there.