MM has things no other Zelda has, but the temples and bosses are my favorite part of Zelda, and OoT destroys MM in that department. OoT have twice as much dungeons/temples (including two mini dungeons of sorts), with OoT's temples being superior and more memorable imo, along with much better, challenging, and more memorable bosses. Plus, OoT's Ganondorf was a better and more epic main antagonist than Majora's Mask was, along with giving us one of the best/most epic final boss fights in video games. Majora Mask on the other hand, gave us a final boss fight that, while having the traditional stages of a final boss fight, wasn't really good or challenging, and lacked the epicness a final boss should have.