Which is better, an AB or ScB?
A. You will hear many opinions on this but here is the truth: Neither is inherently better! The program you pursue should above all reflect your interests, abilities, time constraints, other interests, and career goals. AB programs permit more time for you to pursue other electives outside science, a boon if you wish to explore other academic areas. Also, AB programs may be embellished (for example, by adding courses beyond the minimum number required; also, by including or adding a research project - BIOL 1950/1960 are the course numbers for Directed Research/Independent Study Projects).
The ScB programs include most of the required courses for students aiming at medical, dental, veterinary or graduate schools in the biological sciences. HOWEVER, such schools, or even future employers are much more concerned with these factors: challenging thoughtful courses; well-rounded skills; focus; research experience; interesting extracurriculars. These factors are more important than AB vs ScB per se.