Sorry, my calculations above are incorrect. The difference between splitting and standing is even greater than I stated.
The actual return for splitting 10,10 against a 6, according to the Wizard’s chart I posted before, is 0.4681 (versus 0.704 for standing)
So you make $70.40 in total by standing and $46.81 in total for splitting.
It’s not even a close call. Never splitting tens is one of the clearest decisions in the blackjack strategy charts.