If you compare Stockholm with other major cities like Copenhagen or Berlin it differ quite a lot in amount of population. So that's why Copenhagen and Berlin are more favorable. But Denmark's problem is their view on immigration and integration. It's quite racial and anti forreign culture. That makes Copenhagen a city with with a lot of traditional structure and culture. Comparing to Berlin who has a more open minded view, on new influences.
Thanks for the information! I googled the population of all three and I see what you mean about the population difference between Stockholm and Berlin. The odd thing is, according to google Copenhagen is smaller than Stockholm. Must have something to do with whether they just count the city proper as opposed to the surrounding areas, or something like that.
For example Minneapolis, where I live, has a population of just under 400,000, but if you count the whole metropolitan area it's nearly 3.5 million.