Bonus Blackjack: In early blackjack history, a jack and ace of spades won a special 10-to-1 jackpot. Bonus blackjack makes it five times better, with a 50-to-1 bonus jackpot.
Double Exposure Blackjack: In Double Exposure Blackjack, both of the dealer's cards are face up. It takes a lot of the guesswork out of your blackjack strategy, as the double exposure gives you more information on which to base your decision to stand, hit, double down, or split.
Hi-Lo-13 Blackjack: Hi-Lo-13 is European Blackjack with a side bet on whether the total of your first two cards will be higher than 13, lower than 13, or exactly equal to 13.
High Streak Blackjack: Blackjack is often a game of streaks. High Streak Blackjack awards special bonuses for winning blackjack streaks when you win two, three, four, or five games of blackjack in a row.
Perfect Pairs Blackjack: In the Perfect Pairs blackjack game, the Perfect Pairs side bet pays out a bonus jackpot every time you get a pair, and it pays even more if you get a perfect pair.
Pontoon: Pontoon is UK-style blackjack. It has its own special vocabulary, and a bonus for a "5-card trick."
Spanish Blackjack: If you remove all four 10s from a standard 52-card deck of cards, you have a 48-card Spanish blackjack deck. To make up for the missing 10s, Spanish Blackjack awards special bonuses for certain combinations of cards.
Super Fun 21: Super Fun 21 is a super fun online blackjack game that pays out bonus jackpots for a five-card 21 and a diamond blackjack.
Triple 7s Blackjack: Triple 7s is the wildest online blackjack game of them all. It has a progressive jackpot that gets bigger every time someone plays Triple 7s blackjack online. Get three diamond 7s, and it's all yours.
Take a look at Double Exposure Blackjack for an example. Seeing both of the dealer's blackjack cards gives you a big advantage in making an informed and intelligent decision as to how to play your blackjack hand in order to beat the dealer and win at blackjack. But the down side is that the dealer wins all ties in Double Exposure other than tied blackjack. That is definitely a disadvantage from the player's point of view.
The bottom line is that every special blackjack game has some variation to the standard rules of blackjack that is advantageous to the player, and also something that is not so great. The best approach is to try all the online blackjack games in Practice mode. That way you can become familiar with the rules and special features of the game, explore its advantages and disadvantages, practice your blackjack strategy for that particular game, and finally decide which blackjack game appeals the most to you.
Then you can start playing for real money, and have a wild time playing some wild online blackjack variations.