I think I have decided that my favorite crawl is the created by writer/reporter Andrew Shackley:
The Jedi are all but extinct, the Republic has fallen and in their wake, the Galactic Empire has engulfed the far reaches of the galaxy in fear.
Persecuted members of the Old Republic have been thrust into hiding. Only members of the REBEL ALLIANCE dare take a stand against the ruthless Imperial forces.
Deep in the Outer Rim territories, the dastardly Director Krennic has discovered the location of a long lost friend; one capable of completing the Empire’s most powerful weapon yet…
The first paragraph establishes the fall of the jedi, the fall of the Republic and the rule of the Empire. This is what you need for full galactic exposition. Then in the second paragraph it establishes who the Rebels are and how they came about. The last paragraph introduces you to Galen and Krennic while hinting at the superweapon in development. I prefer keeping it a mystery for the movie to take you on.