From a previous post...
The best comparison for .308 battle rifles & carbines can be found in Boston T. Party's "Boston's Gun Bible", March 1998 edition,Chapter 10 - a full 33 pages of comparisons of .308 rifles including individual ratings on 35 distinct characteristics. Excluding price, brass reloadability, parts availability, parts price, mag availability, & mag price (which have nothing to do with the functionality of the rifle itself), The AR-10 came out on top of the M14, FAL, H&K91 & GALIL.
Including all those other things, it was second only because of a late 90's parts availability & mag price issue at Armalite that's been corrected.
Anyway the Boston's book (available from Amazon.com or Javalin Press) with 45 chapters covering The Basics, Combat Rifles, Guns in General, Acquisition, Disarmament, & Courage is worth more than double it's cost - bought 5: sold 2, gave 2 away, and kept one for reference.