Why take either? Colleges use SAT and ACT scores for admissions and merit-based scholarships, though certain schools no longer require them.
Taking the PSAT or PreACT will help you figure out which you're more comfortable with. You do not have to take both (or either, for that matter)!
Subjects: Reading, Writing and Language, and Math
Length: 3 hours
Score: 400-1600
Subjects: Reading, English, Math, Science Reasoning, and Optional Essay
Length: 2 hours, 55 minutes (without essay); 3 hours, 40 minutes (with essay)
Score: 1-36
The HOPE Scholarship is a merit based scholarship that provides assistance towards the cost of tuition at eligible public and private Georgia postsecondary institutions. A student must graduate from an eligible high school with a minimum 3.0 HOPE GPA (as calculated by GSFC) and meet specific rigor course requirements.
The Zell Miller Scholarship is a merit based scholarship that provides full tuition at a public postsecondary institution and tuition assistance at an eligible private Georgia postsecondary institution. A student must graduate from an eligible high school as valedictorian or salutatorian (meeting the requirements of the HOPE Scholarship) or graduate with a minimum 3.7 Zell Miller GPA (as calculated by GSFC) along with a minimum combined score of 1200 on the math and reading portions of a national administration of the SAT or a minimum composite score of 26 on a single national or state/district administration of the ACT and meet specific rigor course requirements.