UM??? idk where you came up with that, but Brotherhood is longer than FMAI like them the same, and they both are really good.
FMA (2003) is basically it's own story with the same basic characters. almost like a Fan Fic. It's a lot longer (almost 3 times as long as brotherhood) and last "Episode" is a full length movie.
FMA Brotherhood (2010) sticks with the Manga, but is short but just as good as the 2003 series.. IMO