People who carry guns carry a Glock.
People who shoot guns carry a P220ST. :-laf
I have one of them. It's a REALLY nice pistol, but too heavy (IMO) for CCW.
Major difference IIRC is the Sig has a full alloy frame and is therefore much stronger, ie, if you drop it on a concrete floor it is much more likely to be in one workable piece when you pick it up. The Glock is all polymer except for the barrel and slide and a few miscellaneous pieces. Go with the Sig. They are made in Exeter, NH by the way.