My favourite of the movies is Prisoner of Azkaban, which is in contrast to my favourite book Deathly Hallows. The thing is they left out things from the early books in the early films, which then meant that they had to leave out bigger elements from the later books for the final films, and so it doesn't feel as complete. My favourite film order goes 3, 5, 4, 1, 2, 7, 8, 6.