Interesting thread. I've had my M&P 9c for a couple of years now, and like the gun OK. Really like the ergonomics/pointability, like the black stainless slide, and it's been 100% reliable. I am not a big fan of the trigger, not very good... My accuracy with the gun is OK when I really focus on it, but that trigger...
So, speaking to the theme of the thread, I had considered getting a Glock for a few years, but could never break down, and get that soul-less, block of hard-to-point plastic. Then, I got interested in the new Gen 4s, they just felt a lot better in my hand, compared to the older versions. Researched some reported isssues with the early Gen 4s, and decided to get a G19, Gen 4. Well, I really like it. Points well for me, crisp trigger (unlike all of the older Glocks I've tried...), good quality, I shoot it accurately, and it has not missed a beat. I'm shooting the heck out of some x rings with this thing...
So, at this point, I am more of a fan of this new Glock 19, than I am of my M&P 9c. Maybe it's not a fair comparison, as the M&P is a bit shorter in the grip, but not by much when using the mag with the grip extender... I understand that you can do things to improve the triggers of both brands, but out of the box, this new Glock has a much better trigger, and I like the sight picture better, too...
I have not given up on the M&P, but the Glock is more of the 'go-to' rig at this point; I shoot it better.