gotta start a poll :p
yep so I guess this is the third vote, but yeah Twinrova for me. Though I think there were still a lot of missed oppurtunities with the fight, it's still the most memorable and unique. Definitely should have been more difficult for the second/third last boss of the game. I feel like the space that wasn't the platforms should've been lava or something that does damage to you, and I also thought the Sorceress Sisters should've been more aggressive.
Bottom line though, the Mirror Shield in OoT is killer. I wanna see it in another game.