I still have an S&W 3913 in the safe but for a single stack 9mm alloy frame I'll take my Sig P225-A1 hands down anytime. The reliability of both is undeniable but the Sig is more accurate and with a set of added X-Ray 3 sights and the factory short reset trigger it's just a more refined platform than the S&W.
I started out with S&W 3rd gen guns when they were fairly new on the market and I even still have stoning fixtures for trigger work. Most guys discovering the S&W's now are late to the party since they have been out of production for about 14 years now and S&W discontinued parts production not long after that so should parts be needed they may not be readily available such as they are for guns still in production.
Thanks for your knowledge and experience of both 3913 and P225-A1.
The availability of upgrade parts and sights for either platform can make a big difference.
Those SIG X-Ray-3's are an excellent upgrade over the Sig-Lites. My little P290rs was beating up the Sig-lites and after the 3rd warranty claim SIG replaced mine with X-Ray-3's. Same thing happened on the early SIG P365's. So much better and no more failures (so far).
The 3rd Gens were produced with a very short trigger reset; but the SIG upgraded trigger on my P-229 Legion RX is so sweet. I can imagine how well your P225-A1 is with that upgrade too.
Although the 3rd Gen Smiths are long-ago out of production, Novak still offers quite a few sight upgrade options, and because there were so many produced and because of their durability; there are still many in service today. I suspect someone will be offering wear parts like springs, mags, etc. for many years to come.
A former LEO I met at our range recently showed me his sparkling stainless 5906 service pistol he purchased from his Department with well over 80,000 rounds. He sent it to S&W under their 'Lifetime Service Policy' offered back in the day. After a slight bit of arm-twisting they replaced the barrel, ejector, springs, etc. and polished it up beautifully all for
Gratis and a Thank You for his service! Whether you prefer the SIGs or S&W's (or CZ's, Berettas, HK's for that matter), these hammer-fired metal-framed DA/SA pistols along with some parts upgrades and a little TLC will provide many more years of great shooting!