Which number will you bet on?

In our childhood, most of us have played and enjoyed the board games. We also learnt that if we throw a single dice then the chance of getting any number is one out of six.

Let us now visit a game show being hosted by one of our friend. The host invites you to play three dice game.

In this game, three dices are rolled and the sum of all the numbers on each dice is the winning number. You can not refuse to play the game.

You need to choose either to bet on ten or nine. If you get the winning number you win, else you loose. Which number will you choose to bet on?