The EU in my limited experience seems to explain things better, it just goes deeper. Take the Revenge of the Sith novel, the movie was good but the novel kicks its ass. There are so many memorable quotes in it, such as:
"Not without fear, but stronger than fear."
"We don't have to win, we just have to fight."
"In the Force, Obi-Wan was beyond questions."
In terms of the novels at least the EU is better in every possible way IMO.