I have not used much Lapua brass. I did work up a load for a customer in a 338 Lapua using Lapua brass it it was very top shelf stuff.
I have used the Norma brass quite a bit in the form of the 338-378 Wby brass I use for my 338 Kahn. It to is very top end brass. I always check the flash holes for burrs but have yet to find one. Also, there really was not a need to trim the cases because they were all pretty uniform. They are pretty much ready to load as they come.
Either way, both brands are very good quality brass.
I am using Norma 338 Lapua brass for one of my larger caliber Allen Magnum rounds which I started development on. I can get the Norma brass a bit lower in price then the Lapua so I am going to see how they perform, I do not have any worries.
Good Shooting!!
Kirby Allen(50)