Strictly using Wiki Head Coaching numbers there's the Kelly 73% winning percentage vs Leach's 59%. Kelly has won more games (263) than Leach has coached total (252) as a Head Coach. Kelly has 2 Big East Championships, 1 MAC Championship, 3 Great Lakes Conf Championships and 3 Midwestern Conf Championships. Leach has 1 Pac12 Division Championship.
Again, consider this came from Wiki