Wth I don't get any shit.
What is First
Fullmetal Alchemist or
Fullmetal Alchemist Brotherhood
Because in Fullmetal Alchemist In the last episode Alphonese is normal and in Fullmetal Alchemist Brotherhood he is Metal again :|
Fullmetal Alchemist was made first as an adaptation of the then incomplete FMA manga, so it made changes to the storyline and omitted some things from the manga.
FMA Brotherhood is another adaptation of the manga, but it sticks more closely to the manga's plot because when it was being aired, the manga was just about over(or so I believe, the manga might have finished first)
Therefore, if you'd like the true-to-heart FMA, read the manga.
Watch Brotherhood if you'd like a close adaptation of the manga.
Watch FMA Original if you'd like the original anime that branches off from the manga.
I've done all three of the above because FMA is awesome xd
Edit; Damn, the guy above beat me to it xd
Oh well, adding to the post count ^^