Definitely Brotherhood. The ending was epic to say the least, I also love the music and animation in Brotherhood more. Ling is a champ. Roy and Envy are much more badass in this one. I also think it was great the way they use Selim Bradley it Brotherhood. The story is so much better than the original (not to say the original wasn't good). However I do agree with Koby's statement about the first 13 episodes were rushed. I would have recommended FMA Brotherhood before the original to people had it not been so rushed at the start. I recommend people watch the original to get a good grasp on the story and especially to get to know/understand some characters better (specifically Maes Hughes). Both versions are brilliant, however in my opinion Brotherhood is better. It stays true to the Manga, has better characters, music and most of all, much better story. If anyone is wondering which one to watch, I say both. Watch the original first, and watch brotherhood afterwards, but start watching like you have never seen it before (the change in story blows your mind by the end of it). TL;DR: Fullmetal Alchemist: Brotherhood, though both are great.