I don’t know if I have never met any Danes personally, but there are plenty of Spanish exchange students in Ljubljana ( not Portuguese!!!) and they differ a lot with auchtoctone Slovenes. I also don't know how different are Portuguese and Spaniards. We also need to bear in mind that Ljubljana is filled with ex jugo folk so you need to know who is Slovenian and who is not. But if think for slovenians denmark is a better choice
I can also add that people here in munich( german one ) are facially very close to slovenians, so if south germans are close to Denmark slovenes are to