The way most AR owners actually use (or don't use) them, does it really matter which of the manufacturers' guns one buys?
Unless it's really going to get a steady workout, at matches, or training sessions, wouldn't any brand name do?
Barrel length, gas system, sights, trigger....,'etc.
Is any of this of great importance for the casual use that most ARs will get?
Lock the doors, they're coming in the windows.