Financially, they are about the same. I've done the calculations for tuition+housing in my situation and they are very similar, so finance is not a determining factor for me. And I honestly don't know if I want to pursue a PhD, so I guess at the moment, it would be a no. I had been leaning a little more toward Yale, since I went to Columbia for undergrad and wanted to try something different, but of course nothing can compare to NYC. I think my main concern right now is determining which school would be more attractive to employers once I have the MS.
My GPA wasn't so hot: ~3.2. But I went to Columbia Engineering and only took math/science/engineering courses, so I suppose that helped me. GRE: Q164, V163, W5.0. I got into Yale, Columbia, UCLA, USC, Northwestern, and George Washington, all for Biostats, either MS or MPH. Good luck with apps next year! BTW, if you're applying to schools of public health, SOPHAS is seriously annoying. I would like to punch it in the face. Be warned.