This is actually a really tough vote because I like all of these.
The Oasis is a perfect introduction to Animal Kingdom, with animals strewn about in a way that you discover them more than you walk up to an enclosure and see them, and it gives you so many different options of trails to go down and environments to be immersed in. Discovery Island gives you the same sort of thing, with less dense foliage and more Tree of Life.
I really do like ITTBAB, though it's well behind Muppets and Philhar.
FotLK is fantastic and, objectively, the best attraction here. I expect it to win easily, but I'm just not much of a live musical person. It's a testiment to how good Festival is that I even like it.
It'll probably get my vote, but I'll have to think.