I saw a TV special he did for cable. Can't comment about his live show but the TV show was a bit crude in spots. Not something I would have felt having younger teens watch, personally.
Bill Engvall is great onstage, really clean.
Have seen one of Ron White's videos and he's pretty crude at times.
I really don't like a lot of bad language in a show or movie so anything where the F-bomb is used as an adjective or adverb in every sentence is a no go for me, personally.