I have to admit than XP is not very good at battlers, but its maps are awesome.
I love how the new music sounds, so MV will always win to me in that regard, the remixes of 2k3 music are just wonderful, I don't really know if I could count that.
I loved the vx style of battlers, too bad they don't match the characters or the faces, or anything else, so battles end up looking than were made on another dimension. Wich isn't too bad but the rest is so cheerfull.
Seeing advance's sprites, there are really cute, too bad those never came out of japan...
And yes, DS and DS+ sprites are great because they are so cute, but I think they have more consistency than ace between faces and characters. Probably due to pallete limitations.