I have both an MM and AFM. For me I actually play my MM more but it was one of the first games I every owned so I have a lot more history with it. I do find them both very enjoyable to play and with the price points now I would choose a AFM. I actually like the humor in MM. My kids enjoy MM way more than AFM as well. They think the castle is awesome and they like the trolls. If I had a choice at just one I would choose MM but I think AFM is a great game and mine will not be going anywhere anytime soon.
Anyways you were really wanting to know about AFM. Great game, great rules and very fun to play. As others have said above it does keep you coming back for more. Good luck in your decision.