I like that you can get an M&P without a manual safety or LCI, and I think the M&P is a nicely finished gun.
That said, I've been packing a Ruger LCP for two years and it is an astonishing bargain. For a $300 pistol, it shows little carry wear and has eaten 1,000 rounds or so of 5-6 different brands including 3 different JHPs without a hiccup.
If I had the money I'd own both the SR9c and the M&P9c, both are wonderful guns made by solid American companies. I'd trust either. While the SR9c is more affordable, the M&P9c certainly gives you plenty for your money.