Hands down for the CMT. All the BM stocks I've seen since the ban dropped seem to be made of cheap Tyco-esque plastic, while the CMT stocks are make of much more durable (at least in feel) material like the Colt and LMT M4 stocks. CMT stocks are less shiny as well.
PLUS you get a MIL-SPEC buffer tube. I have no clue why some people add out of spec tubes (RRA, BM, etc) to their weapons, since for basically the same price you can get one that is in spec and will allow you to later have the ability to add something like a VLTOR or SOPMOD stock if you so desire.
I'm not saying everyone who buys an AR that comes with an out of spec tube should run and replace it, but if someone is replacing what they have, why limit your options???
ETA: EagleFirearms mentioned above has some of the best prices around.