First of all, CONGRATULATIONS on getting into these 2 great schools!!! That's awesome...you must be very proud.
I agree that you'll probably get flamed for this. And chances are, the person who will flame you will be someone deciding between Meharry and Drexel.
If I were in your position, I would totally go with Harvard. Then again, I might be biased because I want to desperately leave CA for the east coast. I think Harvard could offer a better education simply because of more research opportunities given the HUGE endowment. In addition, I think Harvard has more linkage programs for 3rd world volunteering, research, etc.
The University of California system is currently suffering budget cuts and the tuition at all UC medical schools is increasing. I recommend Harvard...but you're more likely to get a more accurate view if you ask current med students at these institutions. Best of luck to you!