Hold each gun in your hand and rack the slide. I say this because depending on how you hold/grip the pistol,you can see if it will contact the webbing of your hand. For example, I can't shoot Glocks without altering my grip because the small tang,(the part of the gun that sits in the webbing of your hand), because I will get slide bite. It could also cause the gun to not cycle normally. I like the S&W M&Pc for that reason. I can have a high grip and not have to worry about slide bite because the tang is a little longer,but not that much to hinder good control,concealment or feel. You also have the option of a thumb safety,like a 1911 pistol. Not everyone likes it,but at least they have an option. The trigger is smooth,much like the Glock. Don't get me wrong, I love Glocks and have one, but if I don't pay attention to the little things,range day can be a pretty bloody/painful experience.
As far as the PPQ, the pistol is pretty large for ccw, well, at least for my taste. Trigger pull is great and gun functions nicely,like a Walther always does,but like I said,it is large for carry. Recoil is about the same for the Glock and M&P, with the edge going to the M&P, in my opinion.