This is my opinion... I went with ArmaLite because. ArmaLite has been doing the .308 AR-10's the longest, ArmaLite has more options or calibers on the AR-10 platform, ArmaLite was the first to have a "Life time Warranty" for the original purchaser, Other than the company that got the military contracts', ArmaLite AR-10's are the only semi auto .308's that have been deployed into combat. The AMU (ARMY Marksmanship Unit) almost swept the board at the Camp Perry National Matches with the AR-10A4BNMF as a service rifle. If I can think of anything else, I'll add it.