I got admits in Universitat des Saarlandes for a master's in CS, Uni-Potsdam for a master's in Cognitive System and Uni-Stuttgart for a master's in CS. Which should I attend, depending on its education and career aspects?

Universitat des Saarlandes (Computer Science)
2- University of Stuttgart (Computer Science)
3- University of Potsdam (Cognitive Systems)

Which one to attend for winter 2015/16 intake?
Need your suggestion!