they are both reliable, they both shoot very well, they both have superb backup, they are both extremely light, they both shoot good paint very well, they will both break paint on occasion (as will any paintball marker).
I shot an 07 Ego last season and am shooting an A1 this year.
Joy use angels to great effect.
Lots of others use Egos to great effect.
Angel is cheaper than Ego. try both, buy one.