In blackjack, you should generally stand on a hard 17 since hitting could risk busting. However, on a soft 17 (a hand with an Ace valued as 11), it's often better to hit, as it gives you a chance to improve the hand without going over 21. The decision may vary depending on the specific rules of the game, such as whether the dealer stands or hits on soft 17, but the basic strategy favors standing on hard 17 and hitting on soft 17.