In my opinion SAT is better for people who need more time. I always feel rushed on the ACT, but on the SAT I am able to finish with time to double check my work. I would say that the SAT math section tends to be somewhat more difficult than the ACT math. I would say you should take the SAT at least once and see how you do. I took the ACT 3 times and my score was around the same each time even with studying. I took the SAT once and found it to be much easier. It made me wish I would have taken it earlier and not have wasted so much time on the ACT.