My son's duty weapon is an XDm. Why the XDm? Our local, small gun shop owner took over an hour to fit the right size and feel gun to my son's hand. He changed out the back straps on an S&W M&P, an XDm, and a latest generation Glock. For my son's particular hand size, the XDm fit the best and was most comfortable. It also pointed the best - FOR HIM. So the XDm was the one.
I am certain the other handguns were fine and of high quality. It is just that one brand fit better than the others. He has the XD sub compact for a backup.
For me, nothing feels more comfortable than a 1911 grip, except perhaps, for a CZ75B that also feels great. The XDm comes in a close 2nd. Again, that is for me.
Ron