I took great pains to create my blackjack appendices 9A-9H to answer these kinds of questions. For example, in a six-deck game where the dealer stands on soft 17, you would use blackjack appendix 9G. There you can see the expected return by standing on two 10's against a dealer 6 is 0.702826. The expected return by splitting in this situation is 0.622165. So, the player can expect to win an extra 8.07% by standing as opposed to splitting. Don't pay much stock in what other players say or do at the blackjack table.