Russell Kane is funnier than Russell Howard, because Russell Kane has won more comedy awards. Russell Kane has had a long career that has brought him to Australia, as well as being very popular in the United Kingdom. Russell Kane's comedy appeals to wide audiences and a lot of people identify with his jokes. He is more popular and acclaimed than Russell Howard.
Russell Howard is funnier than Russell Kane. Howard is funnier because he does a lot of social satire, and social satire, when done right, is extremely funny. Also, his television show is quite possibly the funniest thing I have ever seen. I am an avid watcher of his show, and I record every episode.