It's my opinion of the CA M14 Scout that the TM is already full metal, so, why bother with the CA? It'll be a copy of the TM, I think...but everything's already done right with this gun. Who knows, though.
Insofar as TM vs CA, I think TM wins pretty much every time. TM S-System vs CQB-R, based solely on performance, I pick S-System. CQB-R wins because you can hold a huge battery, it's metal, and it doesn't have a goddamn hideous SIR on it, even though the S-System has the nicer hop-up.