having played both and beaten both over 3 times, i just love zelda in general
but if i had to choose one to crown the best of the two, i'd say it'd be ocarina of time. The hours upon hours of gameplay, 9+ temples, and huge world packed full of mini games and items to attain make this game well worth any price you'd pay for it.
Not to say Majora's mask isn't great as well, it's got a colorful and fun filled world with tons to do. It's a great game, but doesn't quite take the cake over ocarina of time