It's the fact that they're so different from each other that makes it so that either you can't decide at all, or that it's easy for you to choose.
I like TP more. Partly because of the fact that you can warp and become a wolf at any time but really it was because of some of the new items, the bosses, and the Twilight realm. I also like the style of the graphics in TP more which adds to it.