<p>SAT Vs ACT - the choice has to be made by you.
ACT has Science portion too. ACT is faster but easier in English(that is my opinion of course!). A person of maths/science would probably fair well in ACT than SAT.
If you are a good reader of english books and have a good vocabulary, SAT would probably be better. </p>
<p>It is completely up to you, which one you will prefer! You can give Both!</p>