Which exam to take?

SAT or ACT?

Do you stress about answering every question?   

You will have more time per question on the SAT vs the ACT.  The ACT is notorious for a time crunch

How do you feel about Geometry?  Memorizing formulas?

The ACT has more Geometry questions than the SAT.  In addition, you will need to memorize the mathematical formulas for the ACT exam.  

How's your vocabulary?   

The SAT tests more vocabulary than the ACT.  

Colleges take both exams.  Don't pick one just because "my best friend said it was easier!".   Pick the exam you think will give you the bigger edge.  Play to your strengths.   I can help you sort that out.