I'm a new fan of the FMA franchise as a whole. I've done one of the things most people think is a bad idea - I watched Brotherhood from 2011 before the 2003 version!
I will say that it's a bit annoying to see the start of both anime's right to each other as they start in the same manner, but then they deviates a lot later on. I found the first four episodes entertaining, but compared to Brotherhood the pacing of the first episodes is kind of slow(due to that studio BONES didn't want to repeat themselves when making Brotherhood). But then again - almost every show has a kind of slow start because we need to have a foundation before the 'real' plot can begin.
All in all a good start and the animation is superb when you think about how old it actually is!
The cool thing is that the Japanese dub has the same voice actors in both version of the FMA animes. But the English dub has a different VA for Al(but Ed's VA in English is the still the same). Al's VA does an excellent job and is one of the roles where it actually is a 'real' young boy who is doing the voice acting instead of a woman. It's kind of refressing, because I think that female English VA's has a bit harder by sounding convincing as a boy compared to the Japanese VA's that almost always nails it.
Thanks for reading.