I personally prefer OoT, although I'm not entirely sure why. I own both OoT and MM, and I have to say, I find MM boring. I'm not entirely sure why. It has a decent plot, the atmosphere is very cool, and you have the freedom to do just as much, but it never really kept my attention long enough for me to get into it. I'd turn it on, beat a dungeon or two, then shut it off for a few weeks. I DO like MM, I just can't keep going with it for very long. As I said before, I'm not entirely sure why this is. I've thought it over before, and I really have no answer. The Zelda experience just isn't complete without playing both, though.