I am assuming cost will be factor for OP based on his post.
UNC – top school, classes are hard, like pretty damn hard, Gillings is hard to get into but has top notch research opportunities and lots of local employers that work in health policy related fields. BCBS is right down 15/501, RTI, FHI and a host of other top companies are close by.
GMU – great if you want to work for the government! USAID will be a good place along with NIH and a host of other federal agencies. Plus, cost is low. I have been told that the classes are fairly manageable.
The other options are not comparable to these two IMO. If money is tight then choose GMU, if you want a better pedigree then choose UNC.