Where's the "Probably Doesn't Matter in Real Life" category in the Poll?
Skilled & trained competency, combined with awareness, mindset, overall health (to otherwise survive the physical stresses possibly involved, or take into consideration any disabilities/injuries), knowledge of the applicable laws, familiarity with a chosen firearm used as a dedicated defensive weapon and having some training & experience in using good tactics and strategy in various situations ... are all arguably more important than some perceived inherent superiority regarding either "caliber" or "capacity".
Sure, sometimes I've reached for a 7+1, 8+1, 9+1 or 10+1 capacity smallish 9mm or .40 S&W pistol instead of a couple of slightly thicker and heavier .45's with 6+1 & 7+1 capacity ... unless I simply felt like choosing a .45 that day/evening.
However, I often carry one or another 5-shot J-frame, so how concerned do I appear regarding either caliber or capacity?
Training, training, training ... practice, practice, practice.
I voted in neither category in the Poll.