I gave Fullmetal Alchemist (2003) a watch. I can see how people kind of prefer it over Brotherhood. It's a completely different feel to it, I may not know if the creator even liked it or not seeing how the 2003 anime went a completely different path from how the manga wanted it to go. I don't know if Arakawa even had a hand with it since it feels like they've begun expanding a lot of the characters in it despite some of the filler shit. Like It's nice seeing Hughes in action to really let you know he's capable of getting things done.
The Nina scene now has some fucking weight to it now since we see her around the Elric brothers
edit:also the opening song is better than Yui's Again