Copenhagen I thought was a very nice city with, and the locals were pretty friendly overall in addition to being fluent in English, and the public transit system is pretty good since it operates 24/7. Christiania was weird though (but worth a visit in it's own right) since it is sort of a giant hippie/anarchist commune located in the center of the city, and they openly sell and smoke pot on the streets there. However you are not supposed to take photos of the dealers or the people buying and smoking (in fact I was stopped by a guy just for taking a photo of the sign so I had to delete all of the photos with any people in them) since marijuana is still illegal in Denmark. Anyways Malmo for what it's worth is less touristy and more "industrial" than Copenhagen but was also pretty nice as well.