I would not carry anything but a glock. glock 23 gen 4 is a great carry gun. .40 cal
look how many law enforcement carry glock.
Sig Sauer is great gun too.
I carry a Glock 27 off-duty, which is a .40 cal, holds 9 rounds and the gun is very small, hence the nickname "Baby Glock." The Glock 23, which is also a .40, is another nice gun to carry off-duty or for conceal.
I carry a Sig P220, which is a .45 cal, on-duty, and have so for over 23 years. I've never had one problem with either gun.
I don't personally care for a 9MM, but that's just me.