One evil respects democracy and at least wants to better the lives of most the people in the country. Morally dubious, but has helped more people than harmed.
The other respects only himself and wants to better the life of only himself while using anyone and anything he can to achieve that - remember the time he claimed the election was stolen before it was even concluded? The guy literally has a psychologist in his family who detailed how awful he really is, and was before he became president.
And then there’s RFK Jr. who had a worm starve to death inside his brain. He isn’t necessarily evil, just horribly stupid