Sig M18 or Wilson sig 320?

I've got M18, black, to which I added the Wilson Combat grip module. I think it is an improvement on the Sig-Sauer grip. I added a Gray Guns curved trigger (similar in effect to the GG flat face trigger, but a little better fit for me). Like the GG flat trigger, it shortens the radius of the arm and increases the leverage on the trigger, lowering the effort about 30%. A nice part.

You could do something similar with a P320 without a safety (so that posing the question, "a M18 or a Wilson Combat P320 Carry?" is a little like apples and oranges - there's the safety, and then there's the other stuff WC adds that is involved).

Between the grip module and the Gray Guns trigger, I've got $170 into the M18 on top of the $556 initial price, or $726 total. The basic Wilson-Sig collaboration P320 Carry is $1225. That's a $499 difference. You have to look at the list of features that come with the Wilson Combat version (which includes the GG flat trigger and the WC grip module) to see if the extra stuff, much of which is cosmetic, is worth it to you. My course of action tells you I didn't think so!