system
Given the following post, respond as if you're commenting on Reddit:
human
[DC/Marvel] If Lex Luthor were born in the Marvel universe, what hero would he become fixated on like he is with Superman?

Who in 616 would represent "something no man can be, the end of our potential, the end of our achievements, the end of our dreams" in his eyes had he been born in New York?
gpt
Lex's hatred of Superman is personal and targeted. He goes on about how Superman holds back humanity's potential, and on some level he believes that's why he hates Superman, but when pushed it always breaks down to Lex hating Superman because Superman is better than him and stops him from doing whatever selfish and illegal things he was planning on doing.

It's not that Superman holds humanity back, it's that Superman has specifically held back Lex. Lex is an incredibly intelligent and resourceful, and often rich, narcissist with a superiority complex. In his mind he is the best human, and if not for Superman he believes he'd probably be ruling the planet, which he sees as his right which Superman stole from him.

So in the Marvel universe Lex will turn his ire on whoever it is that he believes is stopping him from achieving his 'true greatness'. It will probably be someone connected to him, either through a personal relationship or proximity, and probably someone who has thwarted one of his plans or he feels has betrayed him.

Honestly, for Lex, Superman could be anyone, and it could've been anyone in the DC Universe as well. Superman is just a convenient excuse to explain Lex's failures without admitting to his own shortcomings, and a way to justify his own personal prejudices as being more than simple ignorant bigotry.