I've shot G19/17s and XD45s and I like the feel of the XD way more than the Glock only because when I bring the gun up it almost instinctively lines up on target, something the Glock never did. Overall I chose the M&P9 just because when all the dust settled it was my favorite of what's on the list and my favorite M&P of all. After spending a long few days at the range with over 500 rounds through it the trigger just fit me and for my has been the most accurate at getting rounds on target repeatedly with the best level of accuracy. The gun is very soft shooting and returns to target naturally. In terms of flexibility I've found that the M&P is, of all my carry guns, the easiest to carry even being full size. After having owned 4 different M&Ps in different calibers and sizes and after owning several glocks, I have to say the M&P is what really amazed me with it's near perfect reliability an with exceptional service from S&W. I've put a total of 4,000+ rounds through the M&P family and only had issues with lead rounds in .40S&W in cold weather, that's it.
I would love some trigger time with the FN though, I really want on in 45.