Which score to submit? ACT or SAT

FutureNow
Fri, 02 Aug 2013 18:12:36 +0000

In applying to UC’s for mechanical engineering which score would I better off submitting given that my SAT score places me in a higher percentile of accepted students than my ACT score, but with a low math score? Should I submit both or just one to both UCD and UCSB?

Sat: 1980
710 R
620 M
650 W

ACT: 28
28M
30R
26 Sci
9 Essay