Some answers
Many Las Vegas counters complain when there's more than 2 decks. Stating that it's too difficult for counting.
That doesn't necessarily mean they are inferior players, just because they understand that 8-decks is a more difficult game. Some of them, however, could be in the category of whiners and complainers,
or may not have the patience or skill level for multiple-deck play.
A well-rounded counter can adapt himself to various playing conditions, but it also is a manifestation of skill and wisdom to seek and play the best games available, with consideration for overall tolerance, long-term survival, and total numbers of games available.
East coast counters on the other hand regularly count 8 deck games and a few can actually beat the house. What do you guys think?
I think you need to look at the bottom lines and compare them. However, I don't think that geographic location is the best of criteria for rating counters' abilities, because many of the better ones play all over, anyway.