I voted for two games. I simply cannot decide whether I prefer Ocarina of Time or Twilight Princess. What I can decide on, however, is the fact that these two are the best video games ever made (IMO). Perhaps they are tied because of their similar, yet somehow distinctly unique, style. But that's not really as important as why these two are my favorites. Frankly, there's too much to say. I probably don't even have to explain why OoT is tied for number one, because even people who disagree understand. However, TP may not be the exact same case.
I love TP because it had a fantastic story, great music (I loved its twists on classic Zelda songs), superb design and beautiful yet dark animation, epic bosses (despite how easy they are), well-designed dungeons, and for many more reasons. Another thing I loved about the game was it's length. Some people disagree, but I loved the fact that it was a massive game. I did a significant amount of sidequesting, but not nearly all sidequesting, and the game still took me upwards of 50 hours in my first playthrough. I just love TP, and I love OoT equally. Is it only tied with TP because of nostalgia? Maybe. But until I decide for sure, these two are tied for my favorite Zelda games.