Early Surrender
Clearly, the two most common favorable rules are the Early Surrender option and the ability to double down after splitting pairs. The two most common unfavorable rules, other than an increase in the number of decks in use, are doubling down restricted to 10 and 11 only, and games in which the dealer draws on Soft 17.
On the Strip, rules vary from casino to casino. In some places doubling after splitting is allowed, while in others it isn’t. Likewise, surrender can be a "yes" or "no" depending on location. In the same casino, rules at single deck are likely to be a little more restrictive than rules for multiple deck. All in all, the Las Vegas Strip with its single-, double-, and multiple-deck games is one of the more favorable locations in the world to play blackjack, but differences among casinos do exist in terms of what blackjack rules apply. So it’s prudent for the serious player to shop around some for the best game available.
