I'd have to go with Peter Pan too - I have always loved it. And the fact that I got to play Mr. Smee (yes, I'm a girl) in my 6th grade play always endeared me to it! Alice in Wonderland would be a close second.
Sleeping Beauty is my all-time favorite ever since I was a little girl. Lady & the Tramp is a close second because I also watched it around the same time I saw Sleeping Beauty for the first time and it just reminds me of my old dog because I chose the name Lady for her.
It was tough for me to choose between the two (Pinocchio and Fantasia) In the end though, there is a certain warmth that I get watching Pinocchio, something beyond the story, beyond the music, especially the the first half. I have never been able to put my finger on it, it's just something truly *magical*. The first time I watched it with my son, I saw a twinkle in his eyes when he watched it, I got a lump in my throat.
"We believed in our idea - a family park where parents and children could have fun- together."