In film format? Fantastic Beasts takes the cake easily. The script was written for film originally and the move itself is far better in pacing and delivery than any of the book adaptations. Additionally, being able to cast from a list of talented actors as opposed to digging through theater classes for decent child actors (even though they became good later on) adds to the quality of the work.
fantastic beasts as the potter movies were so cut up as to be annoying. also fantastic beasts had pro wizards and witches and not kids who had to learn how to do even rudimentary things. the combat was also nice and refreshing.