There’s no inherent benefit to having two scores from different tests. There is a concordance between the two so they are interchangeable.
Have you taken an SAT practice test, under actual timed conditions? Comparing that with your ACT score will give you an indication as to which test is better for you. If you score significantly higher on the SAT (1460 or higher), and it feels like a more comfortable test to you, then it may be worth taking. Otherwise, learn from the first ACT and give it another try.