The Ivalice Alliance music is a bit iffy to me, actually (especially XII). It is about half gorgeous, and half "meh". Some of the pieces are absolutely beautiful, and wonderful mood setters, I admit. But his music is more hit-and-miss than what we got from Yasunori Mitsuda in Chrono and Xenosaga, which is why Yasunori got my vote.
And X-2's Noriko Matsueda will not be considered by me because the main battle music in that game was terrible. No matter how good I think some of the rest of the soundtrack is, the standard fight music disqualifies his work from the running.