I carry a 9mm (Ruger EC9s) because of the reasons laid out in the article. Size, weight, concealability, ammo capacity and availability (although the availability discussion is for another time). Inasmuch as "stopping power", yes there are instances of a crazed meth-head absorbing 4 shots of 9mm before going down whereas it may take only 3 from a .45 to do the same. I really don't see that as a tactical advantage when the aspects of size, weight, etc are taken into account.. Heck, carry a Judge and you;ll only need one but who wants to lug a 2 LB+ revolver around? And the personal and legal ramifications firing 4 9mm's into a BG (and having 7 left) or 3 .45's (and having 6 left) are still the same. Don't get me wrong, one should carry whatever makes them most comfortable and what they are trained on, and I am not a .45 naysayer. Nine mm simply works best for me. YMMV.