I knew this would get a little opinionated, but that's ok. Was really hoping to gets some hard facts about the two problems with each gun.
On the topic of my crappy shooting, I rented one of the new G41s and shot it better than any of my pistols, which doesn't give much credence to the whole smaller grip=easier to shoot well idea. It's not exactly a carry gun though. I got out my G30 and shot it about the same as the others. I felt like maybe the slightly lighter/smoother trigger may have contributed, so I ordered a minus connector for my 19 to see if it might help.
Please save the light trigger in a carry gun lectures though. I'm set on making the G19 work as I had an experience that sold me on Glock at the range last night. I rented a Gen4 G22 and was shooting it side by side with my M&P40 FS(Yes, I dropped some serious dough at the range last night trying to figure this out). I had a round of cheap range ammo that would not feed in my M&P40 FS. I tried to shoot it again, but it FTF'd again. Figured it was out-of-spec, so who cares, moved on. When I ran out of 40 that one bullet was sitting there so I picked it up, stuck it in the Glock mag, and the Glock, true to its reputation, shot it like every other bullet that day. After this happened, I tried to examine the feeding of the M&P when I got home. I only had some Hornady Critical Defense 165gr. I put the round in the mag, put the mag in the gun, and slowly racked the slide back and forward and the round got hung at angle about 1/8" into the chamber. It does not do this when releasing from slide release or when slingshotting it. My G30 and G19 feed so smooth you can barely tell they're loading a round.
I'm sure those with M&P's will scoff at this, maybe mines just a little too tight. I've put at least 500 through it though. Maybe worrying about some ****ty range ammo not feeding is ridiculous as I always have quality HP's. Or maybe I never shoot it worth a ****, but it's still minute of bad guy.
So my quest to conquer the Glock moves on. The conversation is interesting and I'll update my minus connector results when it comes in. It may not do a dang thing for me and then I'll be wondering about the M&P again.