I read Warm Bodies a while back in advance to watching the movie. At this time I am of the opinion that reading the book first is better because I think I generally find more enjoyment in a book than in a movie. Or rather maybe it seems that way because you get pleasure from a book for longer. I will admit it sometimes spoils the movie because I tend to really notice all the little things that they changed. In the case of Warm Bodies however although there were differences I appreciated them both but in different ways.