My favorites are:
Book: Harry Potter and the Goblet of Fire
Film: Harry Potter and the Deathly Hallows Part 2
Book: Order of the Phoenix
Movie: Chamber of Secrets
Book: Goblet of Fire
Film: Deathly Hallows Part 2
Favorite book: Deathly hallows
Favorite movie: prisoner of azakaban
Favorite book: Prisoner of Azkaban
Favorite movie: Chamber of Secrets
That's how I feel at the moment, anyway. Wonder if I'll have time to enter a different opinion before the big shutdown?
Book: I think still Order of the Phoenix, which I know is rather divisive - some people think it's the worst one. I've always loved it, and I think it's the bravest of the books.
Film: I think that Goblet of Fire has passed Prisoner of Azkaban for me. Both great, though. (Interestingly [or not!] they were the only two films directed by people who only each directed one film.)
“Goodness! People come and go so quickly here!”
Book: HP & the Prisoner of Azkaban.
Film: HP & the Goblet of Fire.
Book: Harry Potter and the Half-Blood Prince. It's Harry's best school year by far, and about time.
Film: Can I pick three? Goblet of Fire, because it's well-filmed and attractive, and Voldy returns.
Half-Blood Prince, again, because Harry has a happy (mostly) school year, and that great party scene.
Deathly Hallows Part 2--The story arcs and finishes.