Goes hand in hand with civil liability and what is comfortable
Depends on what's comfortable to conceal and what you can effectively handle. If you're in the desert or a warm climate such as I am then you start to think twice about anything larger than a single stack 9mm, .40 S&W and definitely steel framed.45 ACP pistols.
You then go back to my favorite pet peeve of civil liability if you live in a jurisdiction with no civil suit immunity.
Know the law; don't ask, don't tell.
NRA, NV & UT Certified Instructor; CT, FL, ME, NH, NV, OR & UT CCW Holder
Happy new 1984; 25 years behind schedule. Send lawyers, guns and money...the SHTF...