Billy Connoly knows how to deliver a joke brilliantly, the content is a bit bums and farts for my liking. I think he is really engaging to watch, so I find him amusing for those reasons and I can see why he tops the bill for stand up lists time after time. Peter Kaye is pretty funny but not brilliant.
Personally I think, Eddie Izzard is the funniest man alive. He is just brilliant, the way he just gets lost going off on a tangent and he can do it in french and german too. I would add Bill Bailey, Ross Noble, Jack Dee and Ricky Gervais to the list of people funnier than those two tho.
I cannot stand Lee Evans, I think Bernard Manning, Roy Chubby Brown and Kevin Bloody Wilson are jst awful. Along with Jethro I would be surprised if anyone under 50 foud them amusing. Oh and add Jim Davidson to the about as funny as a train wreck list.