I would disagree with college being equal parts social and academic. It is what you want it to be and if you choose not to take advantage of the social scene, who cares?
That being said, there is a fundamental difference between UChicago and Georgetown. In fact, one of the SFS Deans told me that UChicago is probably the school where you are most likely to find true intellectuals. Georgetown students are brilliant, but they are by no means brooding intellectuals, and if you come here and expect the majority of people will be discussing global issues on Friday nights, you will be sorely disappointed. Georgetown also puts very little emphasis on undergraduate research. (Though there are programs on campus created specifically to address this).
Georgetown will however, give you a lot of opportunities outside of the school. If you want a World Bank internship, or to work on the Hil, Georgetown is an excellent place.
It's all a matter of personal preference.