So I recently learnt that the general consensus amongst anime fans is that Fullmetal Alchemist Brotherhood is better than FMA 2003

The only thing it does better is everything canon before Hughes dies (and the funeral). But that's halfway through 2003 and like 1/6 the length of brotherhood. And maybe sloth being their mom as a twist. Brotherhood sloth is kind of a goofy afterthought but I liked the fight against him.

But seriously name one iconic moment from 2003 that wasn't in the manga.

There's so many from brotherhood, Ed swearing to Al's body he'll be back, wrath vs everybody, Al vs pride and kimblee, Briggs guys murdering the govt official and burying him in concrete, mustang vs lust, mustang vs envy, etc