Funny, MB and TAF are the only 2 games out of my whole collection that I've redecaled the cabinets on. I like both, and probably would give the nod in playability to TAF, as it has more flippers and therefore more opportunity to interact with the ball. My TAF is also not easy, it can play really mean. I've only had her together for 3 or 4 months, so maybe with more plays she'll get a little easier to understand and anticipate bounces.
MB is just plain 'ol awesome to look at, and I love to try to get all the monsters going at the same time I start Frank's multiball. It's just plain fun everytime I play it, though it does seem easier than my TAF by quite a bit.
Although I rank the gameplay of TAF a little above MB, I got my MB first, as it's rarer, with less produced. Lucky I got it when I did, as the price has gone nuts over the last couple of years. Maybe you should get the MB now if you have the chance, before it escalates in price even more. I suppose that's unless the big pinball crash comes and lowers the price of everything, LOL.