RRA's guarantee 1 MOA, so I'd choose that one for a range-rifle. Reliability should be equal.
You really couldn't have made a bad choice between the 2. I own Stag and love it. My favorite dealer did not have any RR on the shelf so for me it came down to Stag or BM. It is very hard to find bad reviews of stag or RR rifles. Enjoy it, it will serve you well!