Without doubt, Arnold followed by Franco.
Not really do with their physique, although I much prefer that build to the modern GH gut-sack-of-walnuts look.
For me, Arnold because of his mentality, his character and charisma. Franco because he was a small fry from Italy (natural bias towards anything Italian) and quite funny. Lou gets a mention because he's a beast, and to this day looks monstrous! I could have nearly picked him over Arnold in that show down.