I believe that honor belongs to the Steelers. Remarkable stability in the ownership, and the coaching staff. They've had, what, four coaches in the last 50 years? Amazing how not blowing the whole thing up every 3 years can lead to success.
Robert Kraft is a dolt who tripped and fell into every success he's ever had. Belichick is so crooked he needs servants to help him screw his pants on every morning.