I've just got done playing AMH and MMR for the last hour. While MMR is better overall, I'm not sure which one I personally enjoy more. AMH is brutal and you need practice on a well set-up example to make progress and form a real opinion.

The biggest negative may be that it is too hard to have broad appeal. I love difficult games but the ghost targets and VUK are unavoidable and create havoc, so either you need to have expert skills or a lot of luck to get deep into the rules and put up a big score. So far, the difficulty just makes me want to play another game.