Do schools really look at the SAT anymore? When I was applying, the ACT was mandatory, but the SAT was optional. I'd suggest taking the ACT (which I did better on) and not reporting the SAT, unless the schools require it / you do worse on the ACT. None of the schools I applied to required the SAT, but it may be different in the south (although I don't think University of Oklahoma required it). What schools are you looking at?
You're in the Midwest, where everyone takes the ACT. Things are different elsewhere. There's no real difference between the two tests.
Like I said - I didn't just apply to the Midwest. I'm not sure what different regions want, but I applied all over (other than the west/southwest).