DC has nothing but the JL7 and dozens of junior versions of each. Literally. Anything else is a sideline character. How many speedsters? Water version of Aquaman characters? Robins and Bats. Kryptonians? DC is literally 7 characters repeated with minor variations. DC is the one with no originality
The number of unique abilities among mutants alone beats the number of unique abilities in all of DC. How many Lanterns are there? Lantern rogues? Putting aside what emotion drives them, that's no less than two dozen characters with the same base ability: hard light constructs powered by a feeling. There's no variety. Just endless repeats.
Objectively, based on actual numbers, Marvel simply has more unique characters and more separate abilities and focuses on a wider variety of characters.
Batman is at least half of DC sales. One ****ing character. That's insanely stupid and micro focused. But DC fans actually have pretty low standards, so... 🤷🏿♂️
Batman has several titles. Occasionally DC books like Harley Quinn's blows up for a while, but per hard data, the vast majority of times, DC books in the top 25 are are least half Batman solos or stuff like Batman/Superman