I got into training and BB around the last 2-3 years of Lee Haney. That guy was phenomenal and under-rated, IMO.
I didn't get into Ronnie much, until late into his career, and maybe even after he left.
For me, a lot of the Olympia winners were my favorite: Arnold, Haney, Dorian, Ronnie, and then Jay. I think Jay, outside of maybe Arnold, has done more for the 'sport' than anybody. Jay was a natural for the lifestyle and ambassador for the 'sport.' I do not think any winner afterward has had that impact like those guys did, at least not yet.
I am a 90's guy, so everybody from that era is my favorite, so I have Dorian up there at the top. That was such a fun and unique time in the sport though...the beginning of the mass monsters, extreme conditioning (ie diuretics and hard dieting), Mexico, the beginning of the message boards and forums, MM2K, Duchaine, actors who actually looked like they lifted, etc.
As far as training...major respect for the guys from the 70's and 80's...just hardcore training for hours and hours every day. It was mostly batshit stupid crap, but those guys and ladies busted their asses. You had the Gold's crew, etc.
I give a thumbs up to Bill Kazmier as well, he was such a gdamn freak. He had such a massive amount of muscle on his frame, and just shear power.
I have to give a shoutout for JOHN MEADOWS. He would have been such a force no matter the era of BB'ing! IMO, he is the greatest loss to our 'sport' and lifestyle than anybody else. I would add Dante/DC into the mix somewhere as well.
Fukk me, i'm screwing up the post and answer by mentioning too many people now, lol.