Definitely agree with Phil over Norm. KF actually has a slight advantage in winning percentage 62.5%/56% and both have similar bowl record win percentages, but KF has been to 3 more bowls. (Hayden has a 6-7 record and KF a 10-11 record). So I think with Hayden vs KF, it's statistically a pick'em in my opinion. I enjoyed Hayden and he is definitely held in high regard. But I'm a KF guy.
Hayden had more of a flair for that southern charm and "aww shucks" persona. But the man was a genius in many ways under the cover of appearing to be somewhat of a country bumpkin. KF probably lacked that personality (especially with the media).
But it's overall hard to even pick. Somewhat how some divide up the GOAT convo in the NBA based upon eras. Incidentally, Jordan is the GOAT in my world. LOL. But we have been blessed with two legendary coaches for the last 46 years. That I think we can all agree on.