I can't tell you from the Emory side, how things would turn out if you transfer there. Jacy seems indicate that you may have a rough time of it anyway after transferring, if you're set on Atlanta Biglaw.
I can give you some idea about what GSU students can expect w/regards to ATL BigLaw, however, for what it's worth (as Jacy noted, no one student's experience is the be all end all here, so keep that in mind).
I just graduated from GSU, and I'm going to ATL BigLaw. Out of my class of approx. 180, I'd say there's about 20 to 25 students going to "big" firms here (which I'm defining as any firm paying ATL market rate, although some are in reality small boutique firms). That number is probably fairly accurate, as I know most of them--might be off by 2-3 students.
I'm absolutely sure that this is a MUCH smaller number (both absolute and percentage of class) than Emory is sending to BigLaw. What these numbers say to me, anyway, is that yes, it's possible to get into BigLaw from GSU, but it's not easy. You generally have to have excellent credentials (top 20% at the LEAST, although top 15% is more realistic, plus law review) to land OCI interviews, although there are a few exceptions--usually folks who have some highly marketable/desirable skill or background (engineers for IP work, for example). If you're closer to the top 30% of your class than the top 20%, I would predict you'd have a difficult time--difficult, but not necessarily impossible.
All that being said, I would advise caution about taking on the extra debt that Emory would bring--particularly since it's difficult to know what sort of success you'll have at Emory OCI (which I do know is MUCH more extensive the GSU's, so that at least would be a plus). To state the exceedingly obvious, that amount of debt can be a lot to bear, particularly if you struggle to find a high-paying job at the end of it because of your status as a transfer.
If you've already been accepted to Emory, you may want to talk with their CSO about how transfer students fair finding the sort of work you're interested in after joining the population. They probably keep track of that sort of thing. One thing I'd be particularly curious about is how you'd be "ranked" with the current Emory students--would you be unranked for purposes of OCI? Our grading curves our significantly different (ours sucks), so I don't know how that would translate. Could be another hurdle for you to overcome.
Good luck with whatever you decide.