I have to say the '90s because most of the shows were great. Even the toons that weren't perfect I have fond memories of. You've got Animaniacs, Tiny Toon Adventures, Batman: TAS, X-Men: TAS, Spider-Man: TAS, The Tick, Gargoyles, Ren and Stimpy, Rugrats, Rocko's Modern Life, Hey Arnold, SpongeBob, Dexter's Lab, Johnny Bravo, Powerpuff Girls, Ed, Edd, n Eddy, and Courage the Cowardly Dog. I like cartoons from all decades, and it might be the nostalgia talking, but the '90s produced some of the greatest toons ever imo.