I'm not sure you do understand, since everyone is saying pretty much the same thing and you seem to keep wanting to ignore it. that tells me that you want to carry the Sig, so carry the Sig.
If I'm wrong...
Go shoot the IDPA classifier, or the Hackathorn Standards, or any similar set of drills and report back your scores. For it to mean anything you need to shoot it at least 5 times with each gun, on separate days so that whatever gun you start with doesn't allow you to get warmed up for the other gun.