Where's Samus?!
Off being too awesome to be draged into this petty debate.
I like Peach. I like her naive yet defiant nature. I think her interactions with Bowser perfectly demonstrate how the role should be written.
Zelda tends to bore me. I generally find her duologue uninspired, though I think she is a good person, honestly interested in her people's well being. She's also kinda hot.