Among the positive rules variations, Five-Card Charlie (+1.46%) and single-deck blackjack (+0.48%) are among the best rules. Among the negative variations, rules like blackjack pays 6:5 (-1.39%) and ‘player may not double or split’ (-1.91%) are the worst.
Please note that single-deck blackjack with 6:5 payouts on blackjack is a net loss for the player. It’s a common blackjack table you’ll find in Vegas casinos. It’s better to play 6-deck blackjack with 3:2 payouts on the natural blackjack.