A toss up between the 60s or the 80s. Both eras had a lot of creative ideas. The SA saw a lot of reboots of old GA characters along with a lot of new ideas like Metamorpho, Doom Patrol, Deadman, Teen Titans, and the original Suicide Squad and Challengers of the Unknown. Characters like Superman and Batman had their histories streamlined while characters like Flash and Green Lantern got new leases on life. The Justice League even lead to the creation of Marvel. Hawkman, the Atom, Earth 2; the list goes on and on. While the 80s saw the books take a more realistic, and in some cases, a more darker turn. DC experimented with an adult line. Superman got a more down to Earth reboot. For better or worse. Batman became even more grounded. Books like Watchmen and V for Vendetta experimented with the genre. Hellblazer and Sandman explored more magical themes and targeted an audience that doesn't necessarily read superhero comics.