This was an interesting topic on the live stream just now so I'll do a quick dive in the NFL and college going by wins and winning percentage of the top 10 coaches in each category.
NFL
Wins
Don Shula - Defense
Bill Belichick - Defense
George Halas - Both?
Any Reid - Offensive
Tom Landry - Defensive
Curly Lambeau - Offensive
Paul Brown - Offensive
Chuck Noll - Defensive
Marty Shottenheimer - Defensive
Dan Reeves - Offense
Winning Percentage - Will only include coaches with 10+ seasons as HC
John Madden - Defense
Vince Lombardi - Offense
George Allen - Defense
Ray Flaherty - Offense
George Halas - Both
Don Shula - Defense
Paul Brown - Offense
Tony Dungy - Defense
Andy Reid - Offense
George Seifert - Defense
Wins: 5/10 are defensive oriented coaches, 4/10 are offensive oriented, 1/10 being both because he was a severe micromanager and owned the team?
Winning Percentage: 5/10 are defensive oriented, 4/10 are offensive oriented, see above for Halas(LOL)
College
Wins
Joe Paterno - Both?
Bobby Bowden - Offense
Bear Bryant - Defense
Pop Warner - Offensive
Nick Saban - Defensive
Mack Brown - Offense
LaVell Edwards - Defense
Tom Osbourne - Offense
Lou Holtz - Defense
Frank Beamer - Defense
Winning Percentage
Knute Rockne - Offense
Frank Leahy - Offense
Urban Meyer - Offense
George Woodruff - Offense
Barry Switzer - Offense
Tom Osbourne - Offense
Fielding Yost - Offense
Percey Haughton - Offense
Robert Neyland - Defense
Bud Wilkinson - Both?
Wins: 5/10 defensive, 4/10 offensive, 1/10 both with Joe Pa coaching both sides as an assistant?
Winning Percentage: 8/10 are offensive, 1/10 are defense, and Bud was both? Maybe y'all can help me how with how to classify him.
When you get winning percentage in college is where it gets completely off track and I believe that has to do with some of these guys being coaches before the forward pass was introduced. Feel free to add your theories here if you'd like as to why this may be? Also if I got any of the designations incorrect please feel free to let me know.