Who is best college football coach?

As of April 2023, Nick Saban is the greatest coach of all-time with 7 modern championships at LSU and Alabama.  However, Kirby Smart is right on his heels with the last two National Championships at Georgia after masterminding four of Saban's elite championship defenses at Alabama.  It is conceivable Kirby passes Saban when he wins back-to-back-to-back championships, something Saban has never done.