definitely NUS, its marketing department rank the second in Asia, CB is good there, unless you don't want to do research. And I don't agree with someone that "好不容易折腾成博士,还是去欧洲吧,至少能旅游一圈". If you only want to travel in Europe, buy youself a vacation package, DON'T waste five years' time and money for the purpose of travel.