A Clockwork Orange may have been a better movie than book... that's because the whole book was written in first person from Alex in his future-speak. Tough to sift through parts of it. Still it was a good book. But the movie was brilliant. The movie was very faithful to the book, only omitting one major scene I noticed. Ending was different, though. The book went a few more years into the future, while the movie stopped after Alex was rewarded.
I've never read the book. I probably should. I love the movie. Malcolm McDowell gives one of my top three acting performances in it.