Obviously I love them all, but if I have to pick a favorite, I go with Prisoner of Azkaban. The Marauders era is the best, and I love Remus and Sirius. =DDD
I'd have to go with the classic Philosopher's Stone, it's my favorite book and movie from the Harry Potter series.
IDK, I love them ALL!! :D
I love Harry Potter and the Philosopher's Stone but my favorite movie is probably the last one :)