I think it's obvious from the replies you are getting that the Bushy fans will vote for Bushy and the Colt fans will vote for Colt. The best thing to do is look at each one carefully, inside and out. I don't mean a detail strip of the bolt or anything, but open the receivers and take a look inside as well as out. Go with whichever one looks the best and has the best quality, fit , and finish overall.
Both companies can put out a great product, and both can put out an xtremely poor one. The same can be said of all the companies that produce any firearm.
Take a look at both since both are right there. Somepeople aren't lucky enough to have the option of looking at one, much less two or more AR's of different manufacture. Get the one that seems to be the better one. Sometimes that will be Colt, sometimes Bushmaster, and sometimes even Olympic. It has more to do with the individual rifle and the experience of the individual assembling the rifle than it has to do with the company and logo on the receiver.