I've fired both fully automatic M-16s and AR-15s and they both sucked.[:'(]

I would assume that the choice of the weapon would have to depend on the setting. I've got a friend who has worked security for that wall that they are building in Israel. They have him carrying an Uzi, but when they draw fire, it is sniper fire from hundreds of yards away across open ground. Under those circumstances, i would just as soon have an old Garand.