I have never seen a Sig P220 in .40S&W. Link to the one you are looking at?
I have some in .45 and one in 10mm.
I like the 1911 and have several but one thing about the Sig, it is one helluva lot easier to field strip and reassemble :-)Same here. As a carry gun, it carries as well maybe slightly better as a comparable 1911. The 1911 has a huge after market support including more and better holsters leap frigging it over the p220... jmo..
Itll come down to personal preference
I like the 1911 and have several but one thing about the Sig, it is one helluva lot easier to field strip and reassemble :-)
I think I am going to go with the SA range officer champion