coming via the Baltic states and headed for Nordkapp, the most logical route would be through Finland, eastern and northern parts being more scenic than south & west. But if you gotta go to Sweden, then try to avoid the coastal route north, its boring.
Norway is without a doubt the most scenic country in Scandinavia, but keep in mind it's very slow-going. And it can rain a lot, especially on the areas near Bergen you'll need to get very lucky to stay dry. But sometimes, like this year, it can rain most of the time in Finland as well.