I could be wrong, but I'd say that except at the high-end for the super-rich collectors (who care for whatever reason), that the PCGS Premium has been coming DOWN (IMO) the last few years. The entire premium thing may have been -- for legit reasons or not -- PCGS was seen as grading conservatively and NGC was grading looser....or that's how people PERCEIVED it, true or not. For whatever reason, PCGS coins traded at a slight/noticeable premium.
And now, for whatever reasons, I think the gap has closed. Aesthetically, I actually love some of the newer NGC labels and slabs. In fact, I wonder if part of the NGC "discount" was when they had that white slab that totally encircled the coin (I personally hate that look, sorry NGC ! ).
Seriously, I do love the current NGC slabs and labels. Bought a few at FUN 2020 and from HA, GC, and Ebay the last year or so, far more than PCGS stuff, a reversal from 3-5 years or so ago.