JMOfartO:
In the past I've owned a Sig P239, Glock 26, and now I own a 3913, and 3913LS.
Here's my take on the three.
1. The Sig P239 is a fine pistol. The only downsides for me personally were I didn't like the factory grips, and my Sig had the long trigger, which just never felt perfect for my hands.. I could have replaced the long trigger with the factory short one and it would probably have been fine. I replaced the factory grips with rubber Hogues which was a GREAT improvement.. Later I replaced the Hogues with a set of Crimson Trace Lasergrips, and that was even better.
I highly recommend the CT's on the P239.
2. Glock 26... I had a couple of these when they first hit the market, and they too are fine pistols. Personally I'm a TDA kinda old fart, and I never felt comfortable with the Glock trigger, and the grip ergonomics of the Glock26 left a lot to be desired, for MY hands..
3. S&W 3913 & 3913LS I bought my first 3913 in 1995 when they were first released and were the "darlings of the gun mags", and I still have it. More recently I have bought a nib 3913LS and also a CS9 and I'm well pleased with both of them too.
I guess "old school" is attractive to me as I'm certainly "old school" myself.. I like the TDA, I like the external safety, and the 3gS pistols have a reputation for absolute reliability, and for me in a carry weapon being reliable is JOB ONE.
All three of the above pistols are, IMO, excellent choices.. Each has it's plusse's and minus's and what fits one person might not be another's choice.
Since you went with the Sig, I think you'll be happy as a clam.. Sigs too are exceptionally reliable, and very accurate.
(Not as accurate as say, an HK P7
, but plenty accurate for self defense work.)
Best Wishes,
Jesse