According to rankings, not much difference between them but internationally both are perceived differently (Cornell faring better bec of Ivy League status).
For international law, Georgetown is better but even so, which would you go for:

Georgetown (with some scholarship) v Cornell (no scholarship)

Money is not really an issue for me but i want to work for a multilateral organisation eventually. Would Cornell be worth pursuing over Georgetown just bec of its ivy league reputation?

Georgetown is so better located.. and not much between the two unis.. and for finding a job i think being in DC can help. Nevertheless wherever you end up going it is a good decision. good luck..

almost all of the most important multilateral organizations are located in DC...some even a few blocks away from GULC and GULC has a lot of externships in this organizations, so I think you have your answer here....