Honestly, the religious devotion to "the chart" has become incredibly tiresome. The condescension that comes with it is irritating as well. All the chart contains is a list of Colt features that may or may not be shared by other manufacturers, and as such, is inherently flawed. The chart supposes that Colt is the only company to build a proper rifle, and disregards any other design as flawed. The chart DOES NOT provide you with any clue about the usability, weight, or accuracy of any of these rifles.
I do not own a Colt, and while I'm sure it is a fine weapon, that does not make any other weapon less good. I am not an AR expert, but I have several friends who are. Some have Colts, some have Delton, some Bushmasters, Stag, DPMS, etc. Ironically enough, they all find different strengths in each rifle that they own. I have yet to hear a Colt owner actually praise their gun as the best of their collection, merely the best mill spec'd. This is why many Colt owners also own other brands, too.
Pick the AR that you like. Nearly all AR's being made are quality guns, "mill spec" or not. If your goal is to fight the zombie hoards in hostile situations, then get the Colt, or better yet, forget the Colt and get an AK. If you want an AR for plinking, fun, or hunting, a Colt actually may not be the best choice after all.