Arnold's best years were 71, 73 and 74 for his combo of size, conditioning and proportion. In 74, even his legs were massive and separated. His 75 and 80 were definitely not his best. Sergio definitely had the potential to be better than Arnold, but he never reached his peak in terms of conditioning. The rumor has it that he refused to stop drinking large amounts of Coca Cola, even before a show and didn't refine his dieting. So if you compare Sergio's best condition with Arnold's best years 71, 73, and 74..Arnold wins. Sergio could have definitely gotten the nod in 72...since Arnold was a bit off. I think if Sergio had lived in California and was eating the same foods and taking the same drug cycles as Arnold, he would have been better. He just never wanted to listen to anyone and wanted to do things his own way. Still one of the all time greats.