Applying to a masters program based on university rankings?

I'd very much love to study Math at the University of Copenhagen.

Since I am an International Student and cannot really see the university before I apply, university rankings will greatly affect my decision.

My only problem is that this university ranks quite low according to Times Higher Education (160th)

I relied on rankings to choose to come to Canada and do my undergrad at UBC (32nd) And it has worked well for me so far.

If I happen to be clever enough to get into a top 50 university, would it be stupid to still go to Denmark?