I like Abe Lincoln, of course, for being awesome. FDR took us through most of WW2 and the Great Depression and I have to respect him for that, no matter the griping people are doing about him. Clinton, despite whining about his marital infidelity (which was really none of our damn business) had the USA out of debt. I don't give a shit who's blowing him so long as he can run the country. But, instead, people flipped their shit and decided it would be better to humiliate him publicly--but that would be more distracting than having a lady on the side.
Least favorite: Not a fan of Nixon and I loath George W. Bush. He's a moron, he spit in the faces of our allies after they showed such amazing support for us and he is completely disconnected from reality. So glad he's gone.