What is this, one of those f/m/k polls?
If we're going with overall funny and such, Kimmel is high on that list - but his show drove into a ditch something fierce a few years ago, and has never gotten out. I've missed Fallon every night this week so far, so I can't comment there really - but his writing staff is great and he has the Roots, so c'mon. Craiggers has a nice charm and rapport with the audience/camera, but he has crappy guests, has a lot of repetitive go-to material (which unlike Conan, isn't self-deprecating enough to be consistently funny), and needs someone to play off of more (either a producer, band leader, sidekick, anything) on slower nights.
Going off the "I'd have a beer with him" test, Ferguson'd win, but he don't imbibe no more. And I'd like to play Century with Kimmel, so I'll say him. (he has a better posse than Craig, too)