It looks like the M6A2 just because it doesn't have the ambi safety, don't know if that is the way it came. I would say go for the LWRC, but that is a preference. They are comparable in capabilities, however, with the pinned sure fire brake, you are limited on options for surpressors, but that shouldn't be a huge deal. Personally, I would go with the LWRC because they are about 4-5 ounces lighter typically, and because I like the aesthetics more than the POF. It also depends on the guy you are trading with and what he wants to do with the POF and what you want to do with the LWRC.
my advice, take it, just make sure you are happy with it and the options it gives you.