It has been true for a long time. The best 9mm are very effective.
I still prefer a .45 but would never complain about the 9mm, especially with high capacity mags.
Well, a 9mm is certainly better than my .380, but I’ve been a fan of a bullet that actually knocks the guy down for a long time. Hence my attitude about the .45.
Plus, when one is being pointed at you it just LOOKS scarier. :-)