Actually Arnold is on record stating Flex is the best bodybuilder he has EVER seen....He said it after on of Flex's Arnold Classic wins...I believe it was the 98 Arnold...This was pre-synthol Flex.
The one problem that Flex had is his torso thickness and fullness suffered when he
got in extreme condition. The pictures of Flex from the AC 1993 are incredible but in the actual video
he is less impressive. Paul Dillett made him look like a child but Paul's poor back permanently sealed his fate. I also have the 1998 AC video where Flex is around 236; 1993 AC 216; and I am overall more impressed
with his 1998 Arnold look - on video anyway. He was very ripped but with added size.
If flex could have retained the thickness and fullness in his back and chest that he had at the 1993 Ironman with the condition of the 1993 AC he may have been unbeatable. He never attained this look though.
His closest was the 1998 AC.
I think Flex was using synthol in 1998 but it was barely noticeable on the 1998 AC video.
A 1973 or 1974 Arnold or a 1993/1998 AC Flex is almost a tossup. Flex lacked some torso balance
and Arnold needed a tad more leg development.
Regardless, Two of the greatest physiques to ever grace the stage.
A 1974 Arnold capture from youtube...
Check out Arnolds supposedly weak triceps..