Should I submit ACT or SAT?

Green_Apple5
Sat, 28 Jun 2008 15:31:33 +0000

So I have taken both tests and the subject tests. I plan on retaking some of them also.
ACT: 28
SAT: M-680 CR-650 W-650
Subjects: Bio-710 Math2-650 USH-640

Which is stronger? My ACT or SAT+Subject tests? Which one would be better to submit to colleges?