She specifically cites the following reasons:
* Darker Tone: She enjoyed the darker, more complex story and the film's more mature themes compared to the previous films.
* More Mature Role: She felt Hermione's character development in "Prisoner of Azkaban" was more interesting and gave her more to work with as an actress.
* Working with New Director: She appreciated the fresh perspective and direction brought by Alfonso Cuarón, who took over directing duties for this film.
* Stronger Performances: She felt the overall performances in the film, including her own, were stronger and more nuanced.
While she enjoys all the Harry Potter films, she has consistently said that "Prisoner of Azkaban" holds a special place in her heart.