Hi, I am seeing some Prvi Partisan and some of the XM193 Lake City Military .223 ammo around. Both seem to be aronud the same price. I am wondering, for AR-15 guns, such as Rock River 16" and DPMS 16" barrel rifles, which brand would you prefer shooting? Is there any other in the 0.40 a bullet price range you prefer more than the two I mentioned? I also see PMC, usually for cheaper, but I am told its inferior to XM193.