I own both. Love them both for much different reasons. AFM is more difficult and more of a "players" game. It's also extremely well rounded...great theme, artwork, rules, dots, callouts. My only criticism is if you don't add the popular mods, it can look stark (especially for the money).
RFM is pure fun. It one of the easier pins in my collection, but the history/technology/humor/audio are first rate. I've come close to selling mine, but after adding a 21" LED and supercharging the processor/audio, it's a keeper.