I prefer our American military 5.56 cases made at Lake City Army Ammunition Plant because it is very high quality brass and made harder in the base than any commercial .223 case.
It does require removing the primer crimp if you buy it as is, BUT I just bought 500 5.56 LC cases that were already deprimed, cleaned and the crimps removed.
Lake City cases have the most case capacity.
The Lake City cases have better uniformity than Remington and Winchester but not as uniform as Lapua. Meaning they are a much cheaper option than buying Lapua brass but require more prep work.
The base of the 5.56 case is made harder and is thicker at the flash hole web area.(making them Ford Truck Tough)
Below the center case is a Federal and the two outside cases are Lake City, and you can see the thicker web area on the Lake City cases.
Bottom line, I would rather buy Lake City cases for much less than Lapua and spend the time prepping these cases.
But I'm retired with nothing to do and all day to do it.