Ferguson is probably the funniest, but sometimes his humor tends to run a bit inside. The robot sidekick is almost never funny.Fallon is the best if you are into music. He also has the funniest sidekick. Some of his bits get really old really quick, especially any time he tries to involve the audience, which is quite often.Kimmell is the best if you like sports. His overreliance on promoting ABC's lineup is a weakness.Conan used to be edgy, but he has largely gone the way of Letterman, relying on old bits to get him through his monologue.Almost all of these guys borrow from Letterman more than they would likely admit, but Dave no longer has his bite.Leno is what people without a sense of humor watch in order to pretend they are being entertained.