RE: best AR 15?
Buy the parts and build your own!!!
I have 2 1/2 AR-15's.
First one is a 16 inch Bushmaster, 6 pos stock, A2.
The second one I built myself. It's a DPMS lowerwith an A2 Stock, Rock River A3 upper in 20 inch.
The 3rd is a Double Star lower with a DPMS parts kits and a 6 Pos. Stock. Haven't decided on a upper yet, but most likely will go with a 16 inch flat top upper, with mid-size length4 rail tube with a Yankee Hill flip up front site.
The 4th will be......????