I would say Ronnie all the way. I've seen all the videos and it's clearly Ronnie. Since when is high volume not high intensity? It would be different if Ronnie was doing 25 sets for chest and only benching 135lbs, but that is not the case. It's easier for me to get under the squat rack and do one heavy ass balls to the wall set than to pump out 25 sets of heavy ass leg presses, squats, hack squats, walking lunges, and leg extensions. At the end of balls to wall squat session I can walk just fine, but by the end of a hardcare marathon I can barely get out of the gym.
Add to the equation the fact that, until recently, all of that training took place in that sweatshop, disguised as a gym, called MetroFlex.
As you've probably noticed, this really isn't about soliticing your opinion (or that of anyone else). Bluto has clearly indicated that mentioning anyone, not named Dorian Yates, constitutes a wrong answer.
And lost in all of this is the fact that bodybuilders get no pats on the head for training "high intensity". It's the end result, not the process that gleaned such, that gets judged onstage.
If you have a better physique than I do and we compete against each other, NOBODY is going to care if I trained "harder" than you.