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CS or Information System?

It depends on program curriculum, I think the IS option will be helpful to study quant if the program have a stroug courses on database management, database architecture, data mining, machine learning and a lot of programming (C++ or java).
I agree with Andy : Taking the easy way early is going back to hurt you later.
IS is usually more geared towards eventual IT work, so the programming and theory requirement will be less intensive. Though IS will probably include a database course, which you can easily include as part of your CS studies.