I have shot at least one from each brand of the listed polymer pistols and really did like the M&P 9. I have kept it mostly stock as of now with nothing but a sight change to XS big dots. Has just under 10K through it and nay a hiccup, so it is my favorite. Second would be the Glock pistols due to the overall design philosophy of all the models and caliber lines. It makes for a very versatile and modular autopistol, especially with the amount of factory and aftermarket support for almost every model.
Damian