Here is my take:
Bushmaster is the new kid on the block. TBS they hold their own in all I have heard.
DPMS is nice, good fit, shoots fine out of the box and will hold its own with the best of them.
Armalite a little more money but you get a life time warranty with it (doubt if you will use it past the
break in), good fit and finish.
Knights, huuuummm, proly collectors and SAFE QUEENS, never mind. (If you own one and actually
shoot it, more power to ya, you got more cojones than most of the Knights buyers) Most all the ones I have seen for sale are new, factory fired and been sitting in the safe kinda toys
With that being said, they are great guns, nice finish, fit is great function is great (most of the time)
Eagle Arms is an Armalite with less warranty, built on the same grounds.
I have several Armalites and it is my choice. They shoot good, reliable and no complaints.
If you are looking for a fool proof shooter that has never had a problem save your money till next
season
(anything man made will have a problem/problems)
If I was going to buy another one it would be another Armalite, that is just my opinion and I'm
stickin to it
With all this being said, for the money a DPMS is probably the best buy for the money and most all of them are shooters. Bushmaster, as many have said, proly not worth the extra cost to save on mags (you are paying them for what you are going to save on mags) They
are a fine gun, though, wish they wouldn't lock tight the screws on the gas block
integral, welome to the boards, pull up a chair and sit for a while, you will learn much.
ETA: Oh yeah, there is only one AR10 (Armalite)