From your post I shall assume you mean Aesthetic in terms of bodybuilder physiques rather than talking facial aesthetics into account otherwise that's a whole different story. I personally prefer the more classic physiques which were more focussed on the shape rather than just pure mass like some of the monsters than started to emerge in the late 80s and beyond . Frank Zane is the one that comes to mind when I think of the most aesthetic
Bill Pearl is another one. Unfortunately passed this year aged 91, trained into later life as well.
And of course who can leave out Arnie