I agree it's more of a matter of quantity. However I've seen many times people saying, both here and other places on the internet, that x-men has the...
It's not like you can't have She-Hulk without the Hulk. Both John Byrne and Dan Slott's runs are beloved by the fans. While Reed usually dominates F4...
In most incarnations Lex Luthor hates Superman because he believes that Superman is holding humanity back. In his eyes humanity became soft and lazy...