On our recent trip, I asked my DD8, which Princess she liked best--she said, she didn't really like any of them. She likes the movies with the animals, 101 Dalmations, Nemo, The Lion King. I'm not sure why, because she is very emotional and cries when she watches them!
She used to like to dress up princessy and was Belle for Halloween a few years ago, but now it is the animal characters that she likes.