I think that MA, though more limited in its scope than GA, has a finer finish in its execution. In my opinion MA holds up very well despite several years on the market, and I daresay I've spent as many hours looking at it as anybody except Mr. Sachs himself.
GA has a more difficult problem to solve by being more general and do a lot more. However, I think Eric will get there, and where it is now is pretty impressive.