This is not simply a list of coaches ranked by accomplishment or wins. While those aspects are important, it doesn’t provide a complete picture of how successful coaches are. Winning 10 games at Alabama is different than winning 10 games at Kentucky. Also, every program has a different amount of resources available. Hierarchy in college football also plays a vital role in how successful programs are. It's always easier for programs with more built-in advantages to contend for a national title on a more consistent basis.
A couple of other factors to consider when ranking coaches: How well are the assistants paid? A staff with two of the nation’s top coordinators could be a sign the head coach is better as a CEO and may not be as strong in terms of developing gameplans. How is the coach in the X’s and O’s? Can the coach recruit? Are the program’s facilities on par with the rest of the conference? Much like assistants, a program needs good facilities to win big. If a team is winning at a high level with poor facilities and a small budget, it reflects positively on the head coach. Is the coach successful at only one stop? Or has that coach built a solid resume from different jobs?
Again, wins are important. But our rankings also take into account a blank slate. If you start a program from scratch, which coach would you hire knowing what they accomplished so far and their career trajectory? Remember, you don't get the assistants - only the head coach. And head-to-head wins do not matter for this ranking. Athlon's editorial staff has voted on a ranking of coaches for all 10 conferences. Here are the results for the Big Ten:
https://athlonsports.com/college-football/ranking-big-tens-college-football-coaches-2017