First off:
Vyper45 mentioned:
.....that said, didn't armalite make the orginal AR-15???
Well, sort of. The current rendition of Armalite is merely a renamed company (was it Eagle or Essential Arms?). The Armalite that made the original AR15 was a division of Fairchild and is long gone. My understanding is that the current company has some of the original tooling though. Maybe it's just original drawings. I'm not sure.
On the Colt/Bushy question, I prefer Bushmaster simply because they will sell you replacement parts at a reasonable price. Their rifles are as good as any Colt. There I said it. Some other brands, such as DPMS are a little lower quality, and still others such as Olympic seem to be equal to Colt or Bushmaster. I own a post ban Bushy and a pre-ban PWA (remember them?). Both are fine rifles and neither has ever malfunctioned, except the Bushmaster doesn't like Orlite mags. No biggie, neither do I.
One thing I don't ilke about Colt is their insistance on using non mil-spec parts in the trigger group. That means if you ever need a hammer, trigger, disconnector, etc., you have to buy geniune Colt parts (expensive) Bushmaster does sell replacement parts for the Colt Sporters, but their prices are higher as well, when compared to their price on the mil-spec stuff. Plus if you ever need to remove the upper receiver, you need a screwdriver for the Colt unless you already spent more money to convert it to a take-down pin (front).
Just my $.02...