I'll put a little different spin on it...if we're talking about a shooting, I'd use the Sig because I don't want my Colt impounded as evidence forever by my local PD.
I've never liked this argument. In the grand scheme of grand juries, lawyers, lost time from work, etc. The couple hundred bucks you might save are a pittance.
Use the gun you shoot and operated the best. Personally I don't care if it was a 10k custom gun. If I did my part and it saved my family. It was worth every cent...