All her books are splendid, I have no favourites really. The illustrations are perfectly suited, and I appreciate how she pulls her tales from several different cultures. I adored these as a child, and have read them to my children, and they hold up well.
(Note: I'm a writer, so I suffer when I offer fewer than five stars. But these aren't ratings of quality, they're a subjective account of how much I liked the book: 5* = an unalloyed pleasure from start to finish, 4* = really enjoyed it, 3* = readable but not thrilling, 2* = disappointing, and 1* = hated it.)