As an Emory alum, I can assure you that Atlanta has many more global opportunities than just CDC (though sometimes it does feel a little like Rollins is an MPH mill for CDC!). Additionally, the school has a lot of funding and summer practicum opportunities. Take a look at GFE (global field experience) info on the website. Everyone in my cohort, both inside and outside the global health department, that wanted to get international experience did so and received financial assistance from the school. One of my friends from Emory now works at the NYC health department and another is at ICF in NY, so being all the way south won't hurt your connections terribly! Hopefully you can make it to Visit Emory (and whatever Columbia's equivalent is) since that should give you a feel for your cohort and some of the program offerings. Resources and colleagues should DEFINITELY factor into to your decision. I hope that helps. Good luck!