Material matters too and some cogs are stamped.
Shimano/Dura Ace lock ring is probably the best bang for the buck.
As for cogs, I've only used two of them and I don't have anything to complain about either of them.
Price and quality does not necessary correlate, but EAI cogs are good cogs to use. Of course they can cost up to 30 dollars or so.
Stripping only occurs when you really messed up at installation, grease the threads of the hub and torque it down with a good chainwhip, grease the threads of the hub for the lockring as well and torque it down with a lockring wrench.