Funny. If you want Jazz, you'll want a Sax! Most Clarinets sounds like.. Things I wont say, as to avoid offending anyone, when trying to play jazz. Doesn't sound right to me, anyways.
Scratch that, I mean Big Band and Swing. I know it's really old-school. And I don't know why, but I like how clarinets can be used for a variety of music genres including classical. I don't like the saxophone much.