I'm ready to bring the Arnold VS Mike Mentzer (Volume Training VS HIT) to a conclusion for once and for all. I hereby go on record saying that Arnold is The Man, that Volume Training is the best way to go, and Mike Mentzer was a weirdo. End of story.
As far as Arnold vs Mike, of course Arnold was the bodybuilder with the most success, 7 time Mr Olympia, etc. Also, in his prime he had a better physique than Mike.
This has absolutely nothing to do with which training method (Volume vs HIT) is better. Too many variables and differences between Arnold and Mike to conclude that Volume is better simply because Arnold had the better body.
In my opinion, HIT is the best training method (Jones' HIT or Dorian's HIT, not Heavy Duty) because its the training that gave me best results. Some people say volume is better because it gave them the best results, so to each their own.
One thing is for sure: instead of worrying about whether HIT is better or Volume is better, just train as hard as possible, with the maximum intensity and adjust volume according to your own individual recovery ability and frequency.