Whether you are playing in land casino or some of the online casinos, there is a commission for betting on bank's hand. The bank's hand has the highest chances for winning, and if you bet on it, the commission will be maybe 5% in online casinos, and a little less in some land casinos, maybe 4%.
The house advantages differ accordingly if the game is played with 6 or 8 decks. The simplest way of determining the number of decks is to look at the payout table. If the tie payout is 8:1, it is a 6 decks game, and if it is 9:1, 8 decks game, in most cases.
With 5000 trillion possible combinations for the hand in the 8 decks game, and 900 trillion combinations for the 6 decks game, approximately.
As you can see from the tables, there is a significant difference between 8:1 and 9:1 payouts, and the house advantages for each.
The dealer has an advantage, cause he has an opportunity to choose after player. Therefore, if the player's third card improves his hand, the dealer will take his third card in order to win. Nevertheless, if the player's third card makes the player's hand worse, the dealer can stand and win the game.