The Difference Between Jay Leno And David Letterman

Yesterday, I came across two news items, one about Jay Leno and one about David Letterman, that highlight the major difference between them:
The first was that Jay Leno is suing the writer of a joke book for publishing some of his jokes without his permission. One of the completely original comedic gems in question?
There was a 194-car crash in L.A. — Luckily, the guy in the first car was still able to complete his call.