I don't know anything about the LWRC rifles, however their reptation precedes them. I have to many AR pattern rifles, that's one of the reason I picked up an ACR. Glad I did, my copy shoots well, egonomics fit me very well. Over all if I had to, I would buy another ACR.
But with that said, I have never handled or fired a LWRC. So I can't give you a fair opinion.
Good luck and I hope you pick one that suits your needs well!!