Bought a used Sigma (SW9VE), wouldn't group consistently, sold it.
Bought a new P95, like it, shoots great but a little chunky.
Gonna buy the replacement for the Sigma, the SD9VE down the road.
After shooting both, I think I prefer the S&W, but will buy a new SD9VE. I prefer the DAO option and no manual safety (SD9VE), over the slide mounted safety/decocker(P95).
You won't go wrong with either.