Ok, Stag is not new at the game they are just new at marketing their own stuff.

From what I understand Stag is CMT's own logo.

CMT and LMT make almost everyones parts and forgings except Olympic which makes their own stuff.

Most of the brand names you would recognize aren't making anything, just assembling weapons with CMT and LMT parts.

Olympic Arms is know for tight tolerances in production and a tighter rifle than most. Oly also offers SUM (Stainless Ultra Match) broach cut barrels which will put almost all other AR barrel makers to shame. Mil-Spec puts accepted accuracy in the 2-3 MOA range where Olympic expects .5 MOA on their standard barrel and .25 MOA on SUM barrels.

To take a long explaination and summarize....both are excellent firearms and parts of which I personally own many of each.....all without fault.

EDIT: I would purchase which ever I could find at the best price.

It sounds like you are getting the same answers from everywhere you are posting this question all over the internet