Sorry about that, I wasn't trying to say the question wasn't asked in good faith, it was meant light hearted what with the general tension with the recent election.
Which, I think that also points to the likely pick for me, though I'd definitely say that Johnson is a damn good bed example of a president. I mean, dude came in after a civil war and set back part of what was accomplished by playing wimp with the ex confederate states. He single handedly set up another century of oppression and strife.
Best though? That's actually harder. To be the best you have to have done something that stands out, which means there has to have been something big during your presidency to give you that opportunity. It means that some of the good presidents might not have shown their greatness as presidents because they didn't have anything to work on, or maybe didn't have a Congress willing to work with them.
That being said, Franklin Roosevelt has to be an option for best. The man made plenty of bad choices, but he was the leader that the country needed at the time, and did his best at every step (even when it turned out less than stellar), and that is pretty much all anyone can do.
Lincoln is another pick for the same reason. Gets elected during the most turmoil ridden era, and manages to get the country back together during a war that could well have led to a permanent split.