I ask that question because I'm reading Alan Moore's Swamp Thing and Crisis On Infinite Earths. The sophistication gap between the two somewhat surprised me because Swamp Thing at the time has no mature readers label and vertigo was almost a decade away. For example I just read Swamp Thing #50 which is a code approved book but the story explored nature of evil and deconstructed and subverted good vs evil tropes. Crisis is juvenile by comparison. My guess is most ongoing DC titles were more like Crisis. Indeed the Swamp Thing Crisis crossover feels awkward...was Swamp Thing the only ongoing experimental DC series or were there others?