Advanced Placement (AP) and Dual Enrollment (DE) are two programs that allow high school students to earn college credits. The recent growth of these programs has been unprecedented. However, there is little evidence that compares how they fare in terms of improving college access and success. Using data from two cohorts of all high school students in Florida and controlling for schools' and students' characteristics (including prior achievement), this study examines the relative power of AP and DE in predicting students' college access and success. The study finds that both AP and DE are strongly associated with positive outcomes, but the enrollment outcomes are not the same for both programs. DE students are more likely than AP students to go to college after high school, but they are less likely to first enroll in a four-year college. Despite this difference in initial enrollment, the difference between DE and AP in terms of bachelor's degree attainment is much smaller and not statistically significant for some model specifications. In addition, the effect of DE is driven by courses taken at the local community college campus; there is no effect for DE courses taken at the high school. Participation Rates by District are appended. (Contains 6 tables, 3 figures and 9 footnotes.)