The book was better, we see a more character development and really go on this journey with Adam as he grows and learns that his illness can't fully control him. Adams and Maya's relationship in the book was also far better we connect with them and since they are teenagers they do some risky stuff but we see how their love blooms which make you root for them unlike in the movie where we get one ok scene of real emotion. Also I'm just going to shay it Paul was a real jerk in the movie when he was actually completely different in the book, so ya they had quite a few liberties with these characters and they excluded a lot of awesome people from the book. I'm just saying if you liked the movie read the BOOOK. Or listen to it on audible the reader did such a good job portraying Adam. Well that was my two cents, take everything I saw with a grain of salt as I am but a humble reader and opinions are subjective.