There are a couple of factors to consider when splitting cards in blackjack. The first is whether you think the dealer has an edge.
If you believe the dealer has a significant advantage, then it might be best to split cards. If you think the dealer does not have an edge, then you might choose not to split cards.
The second consideration is your personal playing style. Some players prefer to keep all their cards so that they can make better choices in the event of a tie.
Other players prefer to split their cards in order to reduce their chances of being dealt a card that will give them an advantage. Ultimately, it is up to the individual player to decide when and how to split cards in blackjack.
