Lets see here, Flashpoint story was lackluster setup to what is now known as the lackluster New 52 while Sinestro Corp War was a blockbuster story that setup a new status quo for Sinestro and the Green Lantern universe. This one is hard to vote for...kappa.
Fact. How many New52 books are out there now after so many have been cancelled?
If you answer "Who cares?!" you answered correctly.
Flashpoint WAS fun as a temporary thing; but for it to end and begin something that basically FORGOT the grounds that Flashpoint set; it's a travesty. The fact that Booster Gold was built up to a real hero that protects the multiverse the way he was; to drop all of that and not give him an outlet to repair the new52 ever is a down right shameful crime. Hell, to keep the multiverse/time travelling heroes from remembering that there were other realities is a crime in itself.
Way to take a dump on your fans and your history with THAT one.
I voted for SCW. The Sinestro Corps was scary enough to actually have given me nightmares during a heinous fever I was dealing with while reading that series.