Most durable???
humm: are we dropping these off 15 story buildings or running over them with a semi, or trying to shoot them under water???? None of these traits are part of my criteria to own a "good" handgun. Most of these gun makers out there make damn good and durable handguns. I buy for my particular needs. For range use,I like a bigger gun, mostly all metal with good sites. For personal carry the smaller the better and 9mm and above is my preference (actually 9mm is my choice). I then want lite weight, small, decent trigger pull, some bells and whistles, no external safety features. Then you are eliminating some companies right off the bat, not due to lack of quality or durablility but do to the criteria I have set out for my carry gun, and completly vice-versa for my range and home gun. Probably my G19 could be dropped off a 15 story building and come up shooting but it won't fit in my pocket, so although I own it and love it, it is not my choice for ccw.
Sometimes these questions asked are totally impossable to answer due to circumstances.....