Arnold had a much more "believable" physique. People though Arnie "might" be on steroids. When he came clean (lol!) people believed him when he said he only took some Primo and D-Bol to finish himself off for the Olympia.
However, he was taking juice by the truckload - Deca, Test, EQ, D-Bol, and Primo. But, he still had a very well defined physique unlike Ronnie who looks like an unnatural freak that can't control his use of GH.
However, if Arnie had access to HGH, he'd have taken that one by the truckload as well!!!