The first game i played from the series was OOT and since i've finished it quite a few times, MM on the other hand i've finished only once and didn't enjoy it as much so for me it would be 100% OOT but MM was still a good game.
Funny enough, I think I'm going to vote MM.they wanted to introduce us to a new and fresher storyline and not repeat the same aspects that were in Oot. It also was very challenging and made you think and balance out your time wisely. Also the new transformations were a pretty cool addition to zelda franchise.
Personally, I couldn't even play through Majora's mask (mostly because I rented it) but in the time I was playing it I just couldn't stand the time limit, I don't know why it just really bugged me and I felt like I was being rushed the whole way through the game (though obviously I wasn't). OOT on the other hand I've played through multiple times and enjoy that game a lot.
Perhaps I'll give MM another shot now that it's out on the VC.