To be honest other than the finish, I have yet to see a newer manufactured AR style rifle that is unreliable. I own a DDV4, M&P15, CMMG, & Hk MR556. Each rifle has been 100% reliable. I only have a couple hundred rounds through the Hk, but still. I have owned Colt, DPMS, and RRA's versions too. All function exactly as they were designed. You need to decide which you want, because of the features you like. We can only offer facts and opinions. Best of luck with the decision, and enjoy whichever you choose.
" The strongest reason for the people to retain the right to
keep and bear arms is, as a last resort, to protect
themselves against tyranny in Government...." - Thomas Jefferson