I think that the diffeerece is you can have a visual image when watching the movie and really see what is going on. But when you are reading a book you get the author's point of view first hand, and you kind of get like a personal experience.
Watching a Movie you are shown and imagery of the characters and settings and usually leaves out important details of the Books and reading a book usually creates a more personal experience and understanding word by word your mind is building up a visual reality while in films it is given to you.
