Really not the size you carryll you shoot. 90+% of the time the guy that scores the first hit wins.
I carry a 42, although I shoot a 43 and 28. I have been a firearm instructor for years. I take about 16 hours of private tactical instruction at HAAC Law Enforcement Academy annually.
https://www.hacc.edu/PublicSafetyCen...t-Calendar.pdf
I support everyone's right to carry but would not want to be in the same room if a weekend warrior with little training was defending him/her self.