Either or..
...
I didn't vote because both guns are excellent. I have the P220, and it is the same size as a 1911 commander, pretty thin compared to the thicker/wider slides of the P220 Carry model IMO.
I use Hogue fingered grips on mine and have no complaints, as they're thin grips to me..
But the key is your hands/grip on "each gun" along with trigger pulls..
SAO are great, same light, crisp pull, every shot, and they ccw nice, especially being locked and cocked..
I don't carry my P220, it's the home-cannon.. lol
But, if you are comfy with the Sigs DA/SA, unless you also get one in SAO, more so than the 1911 grip and SAO trigger pulls, or visa verse, then you'll have the "right answer" in your hands IMO, one way or another.
The only other considerations are the disassemble and reassembly procedures. The Sig is a piece of cake (easy) from the get-go and the 1911's take some getting used to IMO.
Enjoy which ever one ya get..
Ls