if you were to ask if books or the movie version of a book was better? most people would answer book. which i think is completely legit. a lot of times movies leave out the best parts of the book, they don't stay true to the story, the characters don't develop. movies often Hollywood(ize) every book, adding fancy special effects where they don't need to be, and making every character drop dead gorgeous.
but i also believe that movies, if done well, add something beautiful to a story. take for example lord of the rings. its one of the best fantasy books ever written, some would argue the best. and yes the movie did leave out a lot of side plot, but they got most of it right. not only that but the movie added something to the story. the music and landscapes they filmed created the perfect touch to middle earth. they enhanced the story, made it better.
so i agree that most of the time movies buthur the books they are trying to be, but when its done right, movies become beautiful representations of books.