Original Fullmetal Alchemist Or Fullmetal Alchemist: Brotherhood?

I have heard from a lot of my friends that Fullmetal Alchemist is a really good anime series but I've never read the manga nor have I ever heard of it before. So I was wondering, as a new comer, what anime should I devote my time to? The original Fullmetal Alchemist anime or the new Fullmetal Alchemist: Brotherhood anime? As far as my knowledge goes, I just know that they are totally different. It would be a great help if you could let me know which one is a better series and which one I would

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