Did you consider a .38 Super? Just sorta curious - not criticizing your choice as I'm a fan of the .357 Sig and the Sig P229. But I also am a 1911 guy at heart, and I'm thinking about getting another one in .38 Super.
Another "1911 guy at heart," here. I was just looking at the web page of a dealer, examining images of a pre-owned high-end/boutique .38 Super 1911, that would be a nice retirement gift for myself, if it stays in their inventory long enough. Or, of course, I could order such a pistol, when the time comes, and I am paid for unused leave.
My first handgun, in late 1982 or 1983, was a Detonics Combat Master, and though it never proved reliable enough for daily carry, the 1911 manual-of-arms has stuck with me quite well through the years. I carried a Stainless Commander as a police duty pistol 1990-1991, until it suddenly became finicky. I resumed carrying 1911 pistols on duty, 1997-2002, and only stopped because the mandated duty holster did not allow me to attain a proper firing grip at the outset of the draw. In 2016, I was able to resume carrying 1911 pistols while on police patrol, in a better holster, a nice way to close-out my LEO-ing days. (I may well work for the USA's largest PD that still allows the 1911 for general street patrol duty. I did have to attend mandated training/certification to resume using a 1911, in 2016.)
The .38 Super has been on my list of very-interesting cartridges for quite some time. It cannot be my duty cartridge, as only 9mm, .40 Snap & Whip, and .45 ACP are authorized, but in a few months, PD policy will not matter, anymore.
Regarding the ballistically similar 357 SIG, I may well get a P229 barrel so chambered, to give new life to the P229R that was my street patrol duty pistol 2004-2015. The .40 Snap & Whip, fired from the high-bore-axis SIG, became too much for my aging, ailing right hand, but my left hand is still healthy, so an extended and comp'ed 357 SIG barrel would be a nice gift for my neglected P229R. The P229, either DAK or DA/SA, is the only auto-pistol I have been able to shoot as well as a full-sized all-steel 1911.