Lex Luthor is politically savvy. In fact, he specifically refrained from running for President as it would mean a pay cut and loss of power. When he finally relented, he won the election and actually did a good job in the Oval Office.
Donald Trump not only wants to be President, but can’t keep his foot out of his mouth long enough to get 10% support for the nomination within his own party.
Trump also had enough “surefire” deals fall though that he’s filed for bankruptcy multiple times while Lex Luthor managed to remain wealthy even when the acting CEO of Lexcorp sold all company assets to the Wayne Foundation. (Conflict of interest prevented him from being CEO and POTUS at the same time.)