I'm not sure who was arguing about the accuracy of Sig's. I can tell you that in the hands of a new shooter, a striker fired gun will be much more accurate than the double action trigger pull of a Sig. This is coming from someone who owns a Sig P229 and owned a P228 and P245. Are Sig's fired in SA very accurate? Absolutely. Is it significantly more accurate than the other brands listed? I'm not so sure. Does the difference in accuracy mean anything at typical self defense distances? Probably not. As for reliability, I'd find it hard to say any of the mentioned handguns, properly broken in with good ammo, is more or less reliable than the others.
The ATF should be a convenience store instead of a government agency!