I prefer Kreiger barrels in my AR's. I like the RRA two stage trigger. Everything else in the rifle doesn't matter much. The roll stamp doesn't matter much.
Noveske hands down but I am biased. I have 5 ARs in 5.56/223. Of those 5, 2 have Noveske barrels. One is a N4 14.5" Carbine gas-length while the other is a 7PT Stainless 14.5" Mid-Length. Both will shoot rings around my 2 Spike's and 1 Stag Chrome-lined barrels. People that knock on the pricey Noveske barrels either can't afford or never shot one before, but that is JMHO.
Here is a good link on ar15 info. Difference Between AR-15 Buffer Tubes. Top right box for different sections
Doesnt cover barrel or bcg's but their is plenty of info on that if you want to search it.
I prefer Kreiger barrels in my AR's. I like the RRA two stage trigger. Everything else in the rifle doesn't matter much. The roll stamp doesn't matter much.
You simply cannot go wrong with Noveske, JP, or Larue. Those are top tier rifle manufactures. I guarantee that after you shoot any of these brands you will be hooked!