First, book. Then, movie.
I think I loved the book better (which was amazing and sometimes overwhelming to read) but the author did a great job directing the movie himself and giving characters the same depth they had in the book.
Thanks Stephen Chbosky for not being disappointing.
It was hard to put every scene of the book into the movie and some scenes were left out but nevertheless he delivered the main struggles characters had to deal with.
I rec the book and movie both. It is something to remember after.