I'm fortunate enough to have one of each. The weight difference, while seemingly small, does make a real difference when carrying in a pocket. Also, the extra weight of the M&P seems to be in the cylinder. The lighter weight of the cylinder on the PD -- at least on my sample -- leads to a lighter trigger pull -- less mass the action has to move. That all being said, the triggers on both my samples are good and I like them both. Between these two, I give a slight nod to the M&P due to the more durable finish and slightly greater shooting comfort. If I was typically carrying one of these in a pocket however, my nod would probably go to the PD.