SAT OR ACT

I did both the SAT and the ACT and got
630 for CR 740 for Maths and 730 for writing(2100) on my second try
For my ACT i hardly studied and got a composite of 30 with a low score of 24 for grammar on my first try but the thing is I got 36 for my essay for the ACT. So should I send my SAT or ACT results to unis? Please help me out

SAT.