Neither has any effect on whether you win or lose long term. We always notice when the player in 3rd base takes a card and the dealer makes the hand. Conversely, we never notice when the player plays wrong and the dealer busts because of the bad play. This is one of the biggest misconceptions regarding card counting. There is no difference in keeping a running count in multiple deck as there is in single or double deck.
Ratios are ratios.
We have more cards to count and multiple deck is not as favorable as single and double deck. We also have to convert to a True Count to adjust our betting and playing. Bad players cause us to lose If this were true, I would never play blackjack again. I am always playing with people who do not know the correct basic strategy for the game. Therefore I should not win if this were true.