This is a hard one to answer considering not many of us can claim that we have owned all the manufactured guns quoted to make a authoraitive decision. Sig comes very close in my decision,But being an old vet I was trained exclusively for the most part with the 1911 platform and I was always the most proficient wit that platform due to my training,so that was always my standard EDC.
I have always sworn by the .45 although I have carried the 9mm usually a Sig,but the one pistol that has NEVER let me down,believe it or not was a basic Springfield Mil-Spec I had it for many years and not once did it ever have a hiccup or a FTF. I guess the more basic the better.So I always went with SA due to the experience I had with that Mil-Spec and never had a problem with there Pistols. So in Ans to your question,If I could only have one it would have to be a Springfield 1911TRP. Nothing beats the SA 1911 trigger!In my opinion there is no other platform safer or faster to implement into action.