Hi wheels,
I think his point regarding which round did a better job was relative to stopping power with a single shot versus multiple shots. His point was that in the corpses he observed where 9mm rounds were used, more often then not, a number of repeated hits were required to cause death. Whereas with the .45 ACP, .40 S&W and .357 Magnum rounds, many of the victims he observed died with a single gun shot. The more powerful round caused significantly more damage than the 9mm round with respect to bone and tissue destruction. But like everyone always says, placement is everything and, as you said, if you can practice more with a 9mm and become proficient with that round, I don't think you would be disadvantaged if reliable hits result versus missing four times with a .45.