AS Exclusive is a nice comparison for me too. EG and G&G make a tighter fit on the last so the shape is more contoured. For me (maybe EG and G&G lasts just maybe fit better), this provides a nice supported fit. The finishing of EG and G&G are also done much better. The color holds better and the finish is more even. Is it worth double the price? That's up to the buyer to decide.
Getting EG and G&G on sale does make it easier to own though.
unfortunately for black shoes, the finishing doesn't count at all, and AS always go on sale too!