Harvard or Rochester Combined Medical Program?

<p>Hi guys,
I was wondering if anyone could offer some advice regarding the dilemma I have. I have been accepted to both Harvard undergrad and the University of Rochester 8-year combined medical program (REMS). I know I want to be a physician and I am scared of the prospect of eschewing the sure thing and not getting into med school 4 years later. Has anyone been placed into a similar situation? How hard is it to get into med school from Harvard undergrad?
Any input is appreciated
Thanks</p>