From Newsarama - not sure when this poll was taken or how it was taken, but here it is. Some really great choices but also some great stories left off. Nothing from the 1970s or before made the list.
https://www.newsarama.com/29630-10-b...e-readers.html
10. SUPERMAN: WHATEVER HAPPENED TO THE MAN OF TOMORROW?
9. THE FLASH: THE RETURN OF BARRY ALLEN
8. NEW TEEN TITANS: THE JUDAS CONTRACT
7. GREEN LANTERN: SINESTRO CORPS WAR
6. BATMAN: THE DARK KNIGHT RETURNS
5. DC: THE NEW FRONTIER
4. ALL-STAR SUPERMAN
3. LEGION OF SUPER HEROES: THE GREAT DARKNESS SAGA
2. CRISIS ON INFINITE EARTHS
1. KINGDOM COME