Straight answers
Should I take the SAT or the ACT?
Colleges that accept test scores accept the SAT and the ACT equally — neither one impresses admissions more than the other. The practical way to decide is to sit one timed practice section of each and notice which format suits you: the SAT is adaptive and gives you more time per question, while the ACT is not adaptive and moves faster per question.
The structural differences, as of the enhanced ACT format in use through the 2026–27 testing year: the digital SAT is adaptive, runs about 2 hours 14 minutes, and gives roughly 71 seconds per Reading & Writing question and about 95 seconds per Math question. The enhanced ACT is not adaptive and its core — English, Math, and Reading — runs about 125 minutes, slightly shorter than the SAT, at a faster per-question pace. ACT Science is timed and scored separately and is not part of the composite score. Whether you sit it depends on how you test: on national test dates it's your choice, but on a school-day ACT the district picks the version everyone takes — so ask a counselor before deciding to skip science prep.
Students who read carefully and hate feeling rushed often prefer the SAT's pacing. Students who process quickly and don't mind moving fast through more questions often prefer the ACT. Neither preference says anything about how smart a student is — it's a fit question, not a ranking.
Do not prepare seriously for both. Splitting practice across two different formats is the most common way students end up mediocre at each. Sample both once, commit to one, and put the reps there.
One caution worth naming: some states administer one of these tests for free during the school day. If that's true where you live, that test is usually the cheaper and more convenient starting point — and your school counselor will know whether it applies to you.