I think I gotta clarify my opinion on Movin' on without you because I feel I was a bit misunderstood so here it goes:
Musically Ayu's version isn't that horrible but I hate that the anger and annoyance that Utada Hikaru has in her voice when she sings this cannot be heard in Ayu's version at all. Her overly cute singing voice completely ruins the song for me. If it was sung as it should be sung Ayu's cover would be fierce/epic as fuck.
And I'm not trying to stir up drama over this song or anything. I just felt like I need to explain my thoughts a bit more.