According to your supplementary question, your situation is very similar to a Hong Kong friend I met at the airport last year. He studied physics in a university in Hong Kong, and came to DTU as an exchange student in the last year, and spent the last 1 year. Now he has gone back. Judging from his experience, at least he returned home with a full load, happily completed the exchange and study, traveled to other countries and made many international friends.
I don't know much about the University of Singapore, because I am also in Denmark, so I still know something about DTU. If you want to compare these two universities, you should first look at what you are studying. DTU is a university of science and engineering. I estimate that the University of Singapore should be a comprehensive university. DTU's engineering and scientific disciplines are also famous throughout Europe, such as physics, chemical engineering, wind power generation, biology, machinery, communication and environmental engineering. Last year DTU merged LMC and RIS? The strength of Danish National Energy Research Institute has been greatly enhanced. DTU has a good relationship with domestic enterprises. For example, the wind power department and Danish windmill company VESTAS have established good research projects. In short, it is a science and engineering class graduated from DTU. Even as an undergraduate, I don't think I have heard that it is too difficult to find a job, which shows the real strength of the university.
The DTU campus itself is well built. I have been to the library there several times, and the school has its own student apartment. DTU is located in the forest ratio of 5 1 area in Copenhagen. If you take the subway for 25 minutes, the B and E trains 10 minutes.
If you are an exchange student, I suggest you choose to go to Europe and change your study and research environment. At least, there are not many people in China, which is very helpful to your English. In terms of consumption level, if you can accept the living expenses in Japan and Hong Kong, you should also accept Denmark. After all, you only exchange for a short time, not live there for a long time.
Moreover, there are many holidays here, so you can go to other European countries for self-help travel with your classmates and new friends. The transportation is convenient and the price is very cheap.
If you have decided where to go, don't be confused by some immediate factors. The experience of studying and living in Europe will certainly add a lot of color to your resume in the future.