You'll find yourself more productive in maya after time... if only for the lack of crashing....

I LOVE A:M to death, it's workflow is the best there is (along with project:messiah) but it's not stable enough and maya is like a rock (well, as much as a complex 3d app can be i guess)...

I think you'll enjoy maya, but its a personal thing.. some hate it, some love it....

just give it time, and don't give up on A:M altogether... I still make my lores mesh in A:M, do an OBJ export into maya then continue from there....