Personally, I like Sora's hair and I don't think it would look good any other way. Riku's was experimented as a child and we all thought it was nice, so he is trying that again. Sora's hair has always looked the same pretty much (minus a few spikes here and there) but as long as Sora's hair has the same bounce it did in all the other games...I'll be Okay lol.