If you want a 1911, go with the 10mm.
If you want a Sig P226, get a .357sig (with the .40 conversion).
The 10mm is a great cartridge for hand loading, no bottleneck hassles, plenty of room in the case for any power level. I shoot a 165 grain plated bullet at about 1,050 with mild recoil in my Glock. Can't get enough of that caliber.
Nobody really does a .357sig in a 1911.
I used to own a P226ST stainless in .40, great gun, would have made a great .357 too. Should have kept that one.
One thing I know about the .357sig, it's LOUD! When an IDPA/IPSC shooter is firing one, everyone knows exactly what it is, and stands back a little further.