Hi everyone! I would welcome some advice from the experts:

I have three or four days in December (sometime between Dec. 13 and 21), on my way to Greece, and I'm thinking of visiting either Copenhagen or Stockholm. Would be my first time to either.

Which one would you recommend, when it comes to holiday atmosphere, Christmas markets etc., and sightseeing during that time of the year in general?

(Another alternative would be somewhere in Germany, such as Cologne or Leipzig, but I've been to pre-Chistmas Germany many times).