It really is a tough call for me because Princess Tutu is right up my alley, however Fullmetal is just pretty wonderful in certain points (and the way Winrey beat Al up with a wrench in Brotherhood was just so much better than what happened in the 2003 version).
I'm surprised that I never got into Fullmetal before now.
So, what do you guys nerd-out over? XP
(Also, I know I hoped to put up a set review this week, but with a whacked out sleep schedule and other obligations and traveling in a few days, it may not happen this week. =/)