Looking to move to full suspension, and it looks like it'll be one of these two. I like the looks of the Fuel more, but the Stumpy gives you a Fox Triad shock so it can be locked out if you choose. Also gives you Specialized's true four bar linkage suspension. Otherwise, they seem to be pretty close spec-wise.

Have gotten a short ride on the Trek, haven't had a chance to try the Stumpy yet.