Which score should I send to colleges?

Is a 21 ACT (19M,19R,21S,25E) or 1070 SAT (500M or 570V) better? They both are ehhh scores but I’m going to improve my ACT score to at least a 27 since it’s easier to study for. But worst case, which one should I send so my chances of getting into a decent school don’t change?