Before Helmer in the Dragon Tomb, my favorite GE book was Prince Lander and the Dragon War. In my opinion, the stakes in Dragon War are much higher than Ember's End, mainly that the dragons that were almost unbeatable and the problems Lander had to face of the different factions. The story was very good overall, I really liked Lander and the other characters. But when I read Helmer in the Dragon Tomb, I was blown away by the massive quality of the book. The story is just incredible, I really connected myself to Helmer, which was very well written as well. The book could be a script for a movie or a TV series. So it's officially THE Best GE Book Of All Time, in my opinion.