Well, Jefferson may be a bit more cheaper. GW also doesn't have any student housing, which is something that Jefferson does offer. I'm not a big fan of commuting-oriented schools because that usually means less camaraderie amongst classmates. I don't know too much about Jefferson's curriculum, but GW's is very lecture heavy. So, that may be a consideration as well. City-wise, I would probably prefer Philly, but Washington is good as well.
But if you really want to pursue something in either health policy, public or global health, then GW may be the place to be.