Well I was working on my reply so I will post anyway. All the guns are excellent choices.
I would seperate into the two price points high and low. In the low I lean slightly to the FNH bacause it is so smooth but Springfield's warranty is one of the best available and FNH has an "implied" (their word not mine) 5 year warranty. So with my wallet I would go with the Springfield and complain about the gun I did not buy, a problem I always have.
I have a Sig P220 (Equinox) and it is an excellent handgun. I have a few Sigs and they have NEVER failed to be reliable, accurate, and fun to shoot. Recently however H&K has been replacing Sig in my EDC and overall predference. It just feels good and you can feel the quality.
Lastly, lately there are just as many customer service horror stories about Sig as H&K. Sig has gotten worse and H&K better. Also as others have said a decocker is not a safety and if you can have a DA trigger on a revolver then the first DA shot should not bother you. My experience in competition is that when the buzzer goes off you will rarely notice the transition from DA to SA. I imagine that that would be the same in a life or death situation of which I thankfully have no knowledge.