Lapua brass is about as good as it gets, it will help wring the last bit of accuracy out of your load. The question is - does it really matter that much in the field?
I use Lake City for varmint loads and Lapua for match shooting. The difference is slight but the Lapua does shoot better groups.
6mmBR had a table of 223 brass comparisons recently and #1 was Lapua and #2 was Lake City, everything else was lower rated.
drover