@ Brownie
LOL
@ Carry
The big three named will not likely lead you astray.
Ergonomics of the XD and M&P IMHO are superior to the Glock.
However, I own the Glock for most of the reasons named above. Proven track record is a valuable thing.
Another less important but useful benefit of the Glock, is the likelyhood of a larger selection of aftermarket accessories.
Case in point, the Pierce finger extension that I have on my G26 has made my firing both more accurate and more comfortable. The Fobus ankle holster I use was $30.00 and easily located at a plethora of locations online and in brick and mortar shops.
The Glosk's grip is on the wider side whereas the M&P just melts into the palm of the hand. Likewise the XD is a bit easier to hold, but its center of gravity seems higher to me. Similar to a Sig in its design, which for me is just something I do not prefer.
The Smith M&P may win in the price department as they are eager to win market share away from the famous Glock brand while ,of course, fending off the competition from Springfield. Thus, the "Next best gun" may be a M&P.
All the best!
Konrad