TexasCHLforum.com

I'm also biased towards the Colt, but comparing these two online it appears the Sig Elite comes with a nicer trigger, stock, & pistol grip (there's nothing wrong with the standard parts on the Colt, these are just nicer). The major glitch I personally would have with the Sig is the description says "lightweight barrel"; I always gravitate to a heavy barrel in a rifle, especially an AR & if you plan to eventually take a class that has a high round count. The photo of the Colt Trooper looks like it comes with a heavy barrel.

One of the nice things about ARs is you can customize them as you see fit, but the stock, pistol grip, & trigger group is easier to do than the barrel.