AFM because of:
-Not spending the game shooting up the middle. More balance on things to do.
-No finnicky Merlin saucer which messes up strategy around trolls and multiball.
-Theme, but that's subjective.
I wanted to like MM more, since I have nostalgic memories playing it as a kid. But even still, I prefer AFM so that's saying something.
BUT Shadow is Brian Eddy's best game.