I have a P95....
It initially had a problem with extracting and ejecting the spent brass.
I sent it back to Ruger and they fixed the problem (it did take them 6 weeks).
It now shoots 100% reliable, but it's not the most accurate of guns.
I'm more accurate with my Glock and XD.
And like others have already said, it is a bit bulky.
I don't have any experience with the Sigma, the Cougar, the Ruger SR9, or the Taurus, but if you can afford it the Springfield Armory XD is very nice.
Good luck and safe shooting.