I would say they are equal in quality but if I had to chose it would be BCM. With BMC's sale page on uppers and current special of a free BCG with purchase of a BCM upper, I would go that route and buy a BCM complete lower from Grant at G&R tactical and call it a day. For around the price of a 6920 you can get a BCM with a Daniel Defense rail or one of the many other configurations BCM offers.
"If you love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsel nor your arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that you were our countrymen"
-Samuel Adams, 1776
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