I don’t really know anything about those two schools. Since you’re posting this here instead of http://talk.collegeconfidential.com/university-pennsylvania/ or http://talk.collegeconfidential.com/johns-hopkins-university/ I’ll give you the best advice I can which is that Brown is the best place to be a pre med: http://talk.collegeconfidential.com/brown-university/1284648-brown-is-the-best-place-to-be-a-pre-med-p1.html
I also noticed from your posting history that you mentioned earlier this year that you were heading off to Temple this fall. Was that a lie or are you thinking about transferring? As a pre-med, I would advise against transferring unless you are so miserable at Temple that you think it is affecting your academic and/or emotional well being.