The title of the poll asks for primary handgun choice, but the actual poll choices are for cartridges. Well, I answered .357 Magnum in the poll, because I shoot a medium to medium/large-framed revolver more consistently better than any other handgun, and the most effective cartridge for such weapons is the .357 Magnum. Favorite weapon among these revolvers? Well, my favorite individual sixgun is a certain stainless steel 4" GP100 with lugged barrel and adjustable sights.
For actual concealed carry, on a daily basis, my 4" S&W Model 19-5 is easier to tote than the GP100, plus I have SP101 fiveguns in several configurations.
When I wear my uniform, I am required to carry a .40 autoloader, and I am OK with that, as one of the authorized choices is the SIG P229 DAK, an autoloader that points and shoots very much like my favored sixguns.