One difference between a book and a movie is that with a book you are

Listening to the voices and attitudes of many different characters.

Interpreting an author’s words and using imagination to picture events .

Watching multiple people perform an interpretation of events of a story.

Watching a director’s interpretation of the events of a story.

Another difference is that with a book, you are able to pause and reflect on the text, re-reading passages or taking your time to understand the content. In contrast, with a movie, the pace is set and you have to follow along in real time without the ability to pause and reflect.