Lately I've been seeing a resurgence on the Interwebz of people professing to carry 9x19mm rather than .45 ACP. The conventional wisdom had been that 9mm lacked wound potential relative to the larger cavity created by the .45. In recent years, there's been data claiming that the wound channel and penetration is similar between those calibers. Furthermore, there've been claims that the .45 can't consistently embed or penetrate in low-grade soft body armor as well as 9mm, including some YouTube videos demonstrating the difference.
For CCW, I'm starting to think that having more rounds is better, because depending on the situation, you may need more. Contrast that with the case of the AWB, where (new) mags were limited to 10 rounds, so bigger was better. For CCW, bigger means more weight for less rounds, so if 9mm has acceptable penetration, and since one doesn't know when he might be facing an attacker with soft body armor, it may be a better choice.
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