There's an excellent article on Bleacher Report written by Jason Cole in which he interviews new Atlanta Falcons coach Dan Quinn. Cole asked Quinn, who has worked for both Nick Saban and Pete Carroll about their differences and Quinn responded with the one thing they both had in common:
Bleacher Report: You worked for Nick Saban and you worked for Pete Carroll. I can't imagine two guys being much more different than those two.
Dan Quinn: That's true...HOWEVER, I've told this story a few times before. Personality-wise, they are so different. But there is a common thread. I think they both totally know how they want to do it, how they want to run their program. They are both so committed to their beliefs in how they wanted to do things that they were actually very similar. As head coaches, they both coach a lot, like literally get in there and work with the players. That said to me that if I ever had this opportunity, I didn't want to be someone who didn't coach.
That left a real impression on me. I remember that, and I remember that they had a deep belief in the philosophy they had in place. Though one was engaging from a personality standpoint and wanted the players in with him and the other was more polarizing and on the players...that way was different. But having an organized vision of how they wanted their programs run was really similar. The programs weren't run in the same fashion, but the attention to detail was.
B/R: Was there ever a time the program got off track for either of them and they had to do something to get it back on track?
Quinn: I think, in a good way, when things got off track they were both totally true to their principles.