I can't help but feel some affinity for Wilson because he did the world a solid by preventing the Kaiserreich from achieving hegemony. Too bad he sucked at everything else and was a genuine prick. So, probably Coolidge.
The man who saved a continent from slavery (sane).
That's the biggest bunch of bull sh**t, imperial Germany was no worse than its enemies and while German victory would have resulted in a German hegemony in Europe, it was preferable to the economic chaos, illiberalism, ethnic cleansings and genocides which resulted from its and Austria's collapse.
It's a fallacy to draw a simple line from "Versailles ---> Hitler". Imperial German hegemony would have been horrendous to nearly everyone who wasn't a German. Just look at the plans for Eastern Europe that Ludendorff was making. Europe did not need to be subjected to that to keep Hitler away from power.