Congratulations. Were you informed very recently or back in mid-February?
I am now waiting from 4 programs and it seems you also applied 3 of those 4, assuming that you applied to UCLA DOTM.
One difference between Cornell ORIE and GeorgiaTech ISYE is the size. While Cornell has 40 PhD students, GeorgiaTech
has around 180. Also, GeorgiaTech has may be two times faculty of Cornell's size. I am not very well in these,
PhD placements of the two programs seem similar, maybe Cornell slightly better. And also as fakeworm said, Cornell is mainly focused on
OR. Financial engineering part of Cornell is more stronger than GeorgiaTech's. It will depend on research area probably,
in which research area are you interested?