I LOVE the M&P's. I enjoyed my Glocks, but they were just dispensable for me, I never had any pride in owning them or cared that much for them. The M&P is one heck of a gun. I had two 45's but they didn't get that much use, but my M&P9 does and I love it.
The only guns I really carry are the 1911's. I really like a nice 1911 and have a lot of pride in mine. I order them exactly how I want them and really enjoy the subtle differences between different makers.
I think Glocks and 1911's are both wonderful guns. I shoot them both about the same speed and similar accuracy, but again, I enjoy the 1911 more and it shoots just a little better for me. I may use the M&P9 along with one or two of my 1911's at an upcoming Magpul Dynamics Handgun class.
If I have a few guns that i can't decide which to carry, I just rotate them. And, before anyone says it, you would have to be at least a little S-L-O-W to "forget" to swipe off the safety. Either that or you might just not train AT ALL or use the wrong draw if you don't instinctively swipe it off. Sorry, I could go off for an hour when I see someone say this. You'd have to be VERY new to guns to have this happen.
Rotate them and carry them all. I envy you having more choices. Me, I'm just stuck on 1911's and carry different ones depending on what I feel like carrying that day. Enjoy them all buddy!