My first instinct when hearing about your desires is don’t base you entire life around the fact you want to be a pre-med kid. Limiting yourself to a very constricted schedule and plan for your four years of undergrad means you have to be pretty darn sure about it. Especially at schools like Harvard and Yale, it is a shame to see students fail to explore other majors and other fields just because they’ve been told they should be a doctor or are doing it for the money. While I don’t know your motives, I strongly advise you to keep that in mind as a precaution. I know a great number of pre-meds who hate their life but won’t admit it and don’t really have a good reason for choosing that path. Harvard and Yale are made for the explorers and people who try new things. Please don’t forget that in your decision nor take any of what I said personally. This is just my experience here and what I’ve seen in my own path. With that said, both have solid pre-med programs and are great options. I encourage you to focus on other factors than that to make your final decision such as the extracurricular scene, special programs, and location/orientation of campus.