I would say that Arnold probably just about shaded the decision in 1980. He certainly got there on his name but his physique was still good enough to be considered better than guys like Dickerson who were just starting thir competitive careers back then.
Yes, Chris had "just started"his competitive career...LOL..I will limit his shows just to the Pro's and will not toss in the amatuer contests.
1973
Pro Mr America - WBBG, Winner
Mr Universe - NABBA, Short, 1st
Mr Universe - NABBA, Overall Winner
1974
Universe - Pro - NABBA, Short, 1st
Universe - Pro - NABBA, Overall Winner
1975
Universe - Pro - PBBA, 2nd
Pro Mr World - WBBG, 2nd
1976
Olympus - WBBG, 4th
Universe - Pro - NABBA, 3rd
Universe - Pro - NABBA, Short, 2nd
1979
Canada Diamond Pro Cup - IFBB, 2nd
Canada Pro Cup - IFBB, Winner
Grand Prix Vancouver - IFBB, 2nd
Olympia - IFBB, LightWeight, 4th
1980
Canada Pro Cup - IFBB, Winner
Florida Pro Invitational - IFBB, Winner
Grand Prix California - IFBB, Winner
Grand Prix Louisiana - IFBB, 2nd
Grand Prix Miami - IFBB, Winner
Grand Prix Pennsylvania - IFBB, 2nd
Night of Champions - IFBB, Winner
Olympia - IFBB, 2nd
Pittsburgh Pro Invitational - IFBB, 2nd