Leno is the worse. He has no skills at all as a late show host. His sense of humor is just sick. For example he goes out into the streets and asks people questions to find the dumbest person and than makes fun of them on his "Walk of Fame" game show. He has contempt for everyone and he is very insincere. Watching his show is appalling.
Conan is the most talented of the late show hosts. The downside is that although his humour seems very impromtu & explosive it boils down to his education and wit. He graduated from Harvard. Conan is like a professer of comedy, he formulates jokes with military precision because he understands comedy as though it were a math equation and all you had to do was balance it. here's what he's accomplished, which was an extraordinary feat:
why is he famous?
Before appearing in front of the camera on NBC, Conan O'Brien was a writer for Saturday Night Live, creating memorable sketches for three and a half years. He continued his stellar writing as a creative genius for The Simpsons, where he later became supervising producer. In 1993, he was selected to host Late Night, a talk show he revolutionized and made uniquely "Conan." Over a decade later, it's still one of the funniest late-night programs on TV. [