Michele Knotz's May sounded prettier and "hotter" when I think about it, but I didn't like it as much as Taylor's May. She's a 10 year old girl who's supposed to have a lot of energy, after all. Michele didn't fit as well to me in that respect. She got the girly-girl part of May nailed though, I'll say that much.
I'll give Michele some credit for her work...her work in Movie 9 was indeed better than Veronica's humming "Do-do-DOOOO-do-do-DOOO!" stuff in Movie 6. What the heck kind of lullaby, 4Kids? Or was that in the ORG JPN as well? Wow, either way, that was embarrassing to play when my parents walked by. xD.
I think Veronica Taylor's May sounded better as a whole. She put more energy and life into it. Always sounding more, well-acted, and younger-sounding. She just sounded more believable to me, I guess. *shrugs*