Both cities, LA and Boston are medical research meccas. USC is 20,000 undergrads, and 47,000 total, but you would be mostly seeing and among undergrads, so don’t count the entire medical school and law school population when you consider “size”. Because LA is just so good for medical research, I would lean towards USC due to the scholarship you won. You can put that scholarship on your medical school resume, it really counts to win a full ride at USC, congratulations, its hard to win that ! . Depending on your own family and high school background, you may find USC really is more open socially and easier to make friends as well.
Harvard, you will go to school with boarding school students, international heads of state children, and other dignitary’s children, as well as a smattering of their diversity candidates who are super sharp. One real plus for Harvard—the sciences, including chemistry and physics are very strong. Chemistry in particular is stronger at Harvard than USC.
What is your intended major at USC and at Harvard?
Where do your parents want you to go to college?
Cambridge weather is awful. Really awful. I am headed there tomorrow, and packing long sleeves, and rain gear. Its been raining and raining this year. Snow can pile so high in Cambridge, that you can jump out a second story window and land in a pile of snow, some years!!! (don’t try that!)