Quoted from Tuna_Delight:Houdini. Cool vibe (if you're into it) and much more code depth and variety of gameplay.
MB is great looking, but would get old for me a LOT faster in a small collection.
MB is too easy. If it wasn't my wifes favorite game, it'd be gone already. Meanwhile AFM is a keeper and Houdini is on my shortlist. Oktoberfest is another fantastic option from American.