The Brotherhood OPs really aren't that good. The song picks are all worse, and none of the direction is as interesting or varied. They're basically just stock shounen action OPs with predictable direction and boring pop songs. Good animation I guess.
I think they're pretty good outside of the last one. 2003 smokes them though.
2003 also has one of the best scores of any anime. Brotherhood has a fine OST but nothing on the original anime.