Carrying a gun makes someone a warrior like carrying a pencil makes them educated.
It takes more than being paid to carry a gun to be a professional.
It think what the OP meant was that those who live by the gun and can carry what they want gravitate towards those platforms.
I am retired now so I can carry what I want, it is a Glock 23.
I guess I wasn't a "pro" when I was in the military, carrying the M9. :-(
Tons of LEO departments carry .357 Sig.
The overwhelming majority of those who actually get paid for work involving carrying a weapon are restricted in their choices of handguns. These restrictions do not always reflect their personal preferences, nor should they unduly influence your choices for your own unique circumstances. The military and large law-enforcement agencies can, however, afford to extensively test and evaluate their choices, so consider that as well.
When I first got paid to carry, the Military overwhelmingly used 1911A1's with some few exceptions, most commonly S&W K-frames. Law enforcement overwhelming used .38/.357 S&W K and J-frames, with .38/.357 Colt revolvers less common.
When I retired in 2003, the military had standardized on the 9mm M9 in the 1980's and .40 Glocks displaced 9mm's as the standard in law enforcement by the late 1990's. Since then, other brands and the .45 ACP and .357 SIG caliber have become more common in law enforcement. The largest department still mandating the 9mm (and ludicrously heavy triggers) is the NYPD.
Self-employed gun gurus (at least those who actually manage to make a living at it), gravitate to the 1911A1's (with various labels) in .45ACP, then and now.
What I have not seen among my active or retired colleagues (federal, state, or municipal) is any voluntary regression to 9mm's, except for those needing extremely compact weapons (and those with qualification issues). Glock, SIG and S&W remain the weapons of choice.
Whether you like what I've said or not, that's what I've seen over the last few decades.
Man lucky me. I have the Colt, the G19, and SIG P229 (close enough). Certainly OP could've put more on there, but there is plenty of reason to go with what he did put as valid choices. Whether that is relevant for your individual circumstances or not is entirely up to you, and nothing to get offended about.
In the late 70's I arrested a "Pro" that used a .22 Ruger Semi auto with the serial number removed. His main profession wasn't hunting rabbits
So does that qualify as a gun a "pro" uses?
Given a choice I think "Pros" would choose an HK USP ahead of SIG.
OK, thread nuked. Time in.
PRO-fessionals aren't necessarily PRO-ficient.
...in any field; doctors, lawyers, pilots, teachers, soldiers, cops etc.
Unfortunately for the public, it's harder to weed out incompetence in the public sector, especially with a union in the mix.
If the Professional people have some slackers, just think of how bad the private side suck, if you use comparative ratio analysis.