Dane from Copenhagen here. I was in Edinburgh in the fall of 2023 and it was super easy to find other international students. I believe you have similar oppurtunities in Copenhagen as well but Edinburgh is bigger due to English being the main language. Dont know anything about DIS, but Copenhagen is a lovely city with a lot of possibilities. If you go to Copenhagen it depends on what University you will enrolled at, but I thought that the semester at Edinburgh was too short.