I agree with what a lot of people are saying in that they "don't feel or play like the same game". They are very similar though.
If have a small collection and are looking for something a bit different to go with the MMr, grab a game with a third flipper and super deep and complex rules like a Star Trek or something along those lines. RFM goes great with MM (I have those two in my home lineup right now, they compliment each other great).