Lapua is NOT the best for Grendel-based cases. It may (or may not be) the most consistent, but it has a very short web and will bulge at relatively low pressure compared to some other brass. If you shoot an AR that has a generous feed ramp cut into the barrel, then Lapua is probably not for you in anything Grendel based.
I also have had to anneal some of my brand new Lapua in 6.5 Grendel (not even necking it up or down) after 6 or 7 of the first 40 rounds had split necks. And all of the Grendel Lapua I've bought had shoulders pushed back .010-.012" compared to the minimum spec chamber in one of my rifles.
Starline, in comparison, is on par for consistency but stronger, and based on the Grendel Lapua cases I've bought in the last 4 years, has better quality control too. I haven't needed to anneal it right off the bat, and shoulders are where they should be. And it's better quality than Hornady, or PPU by far.