For me, I really like "Harry Potter and the Halfblood Prince" , and "Harry Potter and the prisoner of Azkaban". What about you?
IKR!!Prisoner of Azkaban!
I've read it the most out of all of them, probably 20 times.
Also Remus Lupin is the superior Harry Potter character
Chamber of SecretsThe second one
(I forget the name)
Thank you~Chamber of Secrets