I think it's probably worth noting that the biggest Marvel/DC difference when it comes to toys is that Marvel has A LOT of widely popular characters. DC popularity is deeply concentrated in the SuperBats realm, with a decently large dip from them even to the rest of the Big 7. With Marvel, "core popular character" means Spider-Man, Wolverine, Iron Man, Thor, Captain America, Hulk, Deadpool, seemingly Cyclops for some reason, with the mildest possible drop to an A- list composed of the Fantastic Four, Punisher, Daredevil, Dr. Strange, Black Panther, Venom, the entire rest of the X-Men...The tier lists are just so different. So when you combine that broader popularity base with the number of different looks for characters, there's just always going to be a backlog in a Marvel line where a DC line will be selling Rainbow Batmen like 3 years in.