ACT: 32 Comp, 36 CR, 35 E, 29 M, 27 S (essay 08/12)
SAT (superscore): 1470, 790 CR, 680 M (essay: 18/24)
I really need an answer ASAP if anybody is willing to look over this.
I suggest submit both—they show great consistency.
Did you take the SAT subject tests? If not, you have to submit the ACT. The two scores are almost identical – the comparison chart I just saw by googling suggests the SAT is a tiny bit better.