Should I send my SAT or ACT score?

<p>SAT : 1820 first time
1740 second time but went up 20 points in writing
1840 superscored</p>

<p>ACT : 27</p>

<p>Should I send SAT or ACT? both?
I took two SAT tests. Is the twenty point difference in the SAT superscore worth sending my second score or should I just send the first one?</p>