Superman's Greatest Enemy Debate Thread

A Reddit discussion asking which villain Superman has ever truly faced that deserves the 'greatest enemy' title. It's the kind of question that bounces between obvious answers like Lex Luthor and deeper cuts depending on who's answering. The thread inevitably covers different eras—Silver Age absurdity, bronze age grittiness, modern interpretations—because Superman's rogues gallery has wildly different feels across decades. For what it's worth, these threads usually reveal more about what different fans value in Superman stories than they do about the villains themselves.