I am a huge Mortal Kombat fan, and while I enjoy the Zelda games, I'm not a huge fan of them, and this one in particular never did anything for me. While this Zelda game did provide a new epic adventure for the generation that first enjoyed this game, Mortal Kombat created what is, in my opinion, a much more interesting world and concept. Warriors from all the realms participating in a tournament, and if the Earthrealm warriors don't win, then it's game over for life as we know it.
The story was left wide open as well, kind of like a make your own adventure. You could either fight on the side of good as Liu Kang, Johnny Cage, Raiden, or Sonya Blade, or Sub-Zero or you could fight on the side of evil with Kano and Scorpion.
Furthermore, the game revolutionized fighters. They used real actors to play the characters, and the gameplay was drastically different from the king of fighters at the time, Street Fighter, and the arcade gamers rapidly began to favor Mortal Kombat's style better.
For me it's Mortal Kombat, though I can see this going either way.