Bill Engvall is one of the funniest 'redneck' comics I've ever seen. I worked in a comedy club as a door guy during college, and he came to the club a coulpe of times for shows. Drop dead funny when compared to other redneck comics.
Larry the Cable Guy? I don't get his appeal at all. I've watched his shows... and he's just not funny imho. Seemed like his shows were all "lame joke, no laugh lame joke, no laugh, lame joke, no laugh, git-R-done, uproariously funny".
Best comedian EVER imho is Brian Regan. Dana Gould comes in a close second.
Best comedy "group" is most definitely those that do not fit into any specific group. It's like... ok we got a chick coming to the club, chances are that the act is about periods, couch potato men, and shopping. Most black comics talk about ghetto women, crack, and white racists. Redneck comics are about hillbillies. etc. etc.
Then there's those comics who aren't in any one group. Chris Rock (while he does talk about the ghetto women, crack, and white racists, he also talks about the classy women, peep "high on life", and black racists), Brian Regan, Dana Gould, Jon Stewart.
Jon Stewart will have my everlasting respect... for what he did when he came to the club. This was right after his MTV show was cut - so there were lots of little cutie-pie mtv'ers in the crowd during his shows. After the shows, there were quite a few number of little chickies that wanted to "meet" Jon. He said that "he doesn't do that. Lots of people do, but he doesn't do the groupie thing". Of course he probably has, don't get me wrong. Sexy boobies is hard to pass when they get flung at you every weekend... but that was pretty cool of him.