It has to be Otto Graham of the Cleveland Browns, for his Championship record:
- played 10 years of professional football
- played in the Championship game all 10 years
- won 7 Championships, 4 in the AAFC, and 3 in the NFL, would have won at least 2 more except for Paul Browns conservative play calling
- in his last 2 years, 1954 & 1955, he lead the Browns to resounding Championship wins over the Lions & Rams
- the year after he left, the Browns won 5 and lost 7, the NFL had a 12 game schedule back then
No doubt that his Champioship record is one that won't be broke.