You need to state what you are betting on by making a selection, the type of bet and the amount you are wagering. Your selection will obviously depend on the odds offered, so you will want to examine the range of odds available before you make a decision.
Let's say that you are sitting down to play a game of one-deck blackjack, in which the dealer is presumed not to have a blackjack while hitting on a soft 17, if he has a 9 and you have a 7 and 6, it would be preferable for you to hit.
Never let your ego control your play. As the old phrase states ?Living well is the best revenge? and walking away with the chips is a good start in that direction.