All the schools I applied to wanted the SAT. I assumed that still held. Boy, was I wrong. There's a big business in testing, and in deciding which tests to take.
I had no idea that, according to Fortune, the octogenarian SAT and the boomer ACT (born in 1959) are fighting for college test supremacy. In 2009, the tests were taken equally, with most schools accepting either test.
Some teens take both -- and experts think that is a waste of time and money. A better idea is to find which test plays to the student's strengths. A counselor at our teen's school described the SAT as more strategy-focused, while the ACT is more content-driven. Some test-prep organizations give diagnostic tests in both SAT and ACT to help you and your teen determine which one to concentrate on.
Or start simply. Take the PSAT and the PLAN (pre-ACT) in sophomore year to see not only which scores are higher but which test seems most comfortable.
Here's a good overview of the issue. It offers useful information, including a comparison of the two tests.