Man, 2 completely different schools. I'm leaving the state of GA and probably attending Dartmouth in part because I want to do my residency in the northeast, and I want to go to a medical school where there's little stress. I've also spent enough time in ATL, so it's time for me to try something new.
It really all depends on what you're looking for and where you want to live. Atlanta's busier, more things to do (clubs, bars, etc..), spread out, pro sports (Vick), and Grady sees everything. Mild winters, horrible summers (opposite of DMS). More diversity though it's really mostly white and black. I think clerkships are all done around ATL
Hanover's small, rural (though close to Boston and Montreal), beautiful, calmer, friendlier, and easy to get around (ATL traffic sucks!). DHMC is great they don't make you do scut work. Do you like skiing, hiking, fishing etc....? Clerkships done at Hanover and if you so choose, Cali, Miami, CT, Arizona, Alaska, Maine, New Zealand, and maybe a couple I may have forgotten
Emory has letter grades, Dartmouth is H/P/F, it's very easy to get involved in research at both schools, both have good reputations among residency directors, neither administration will push you towards primary care (though Dartmouth spends more clerkship time on it), and both have decent financial aid.
Congratulations, both are great schools!