Pistols
I prefer the Glock 19 and I've had several Sigs. I trade pistols a lot. I've owned most everything. I currently have: 3 semi-Custom 1911's .45 cal, 3 Glock's 9mm/40 cal, 1 H&K USP Tactical SD 9mm, 1 FN Tactical .45, 1 Keltec, 1 Ruger .44 mag, 1 Beretta .22, 1 S&W M&P .357 Sig (just traded it off).
I mainly carry the Glock 19 and the Glock 23 (both Gen 3). I am constantly impressed at just how good the Glock 19 & 23 is to most anything for carry and general use. As I grow older I carry the Glock 19 more, as the 23 is a bit snappy in .40 cal and more expensive to shoot. In my opinion, if you can carry a "bug" gun. You can carry a Glock 19 just about as easy.