Based on several winter trips to Scandinavia in recent years, I recommend at least very good relatively new winter tires in combination with snow chains. Better - and so I do - studded winter tires.
On the often icy roads in Norway, for example, and rapidly changing road conditions depending on the weather, the combination of winter tires and snow chains can be a bit anyoing with changing on and off. Once you've driven with studded winter tires, you won't want to do without them. In addition, studded winter tires offer significantly more safety and thus more relaxed driving. No longer permitted in Germany for a long time except in a very little area near the Austrian border, spikes are commonplace in the Nordic winter. For the use there are also exact regulations. So the use is often limited to periods, usually November to March or April or so and some cities require a special tax when driving through with studded tires.
It is important to inform yourself about the local regulations in the travel countries. In Germany, for example, we have a situational winter tire obligation. In Norway, on the other hand, there is no general winter tire requirement for vehicles up to 3.5 tons gross vehicle weight. However, vehicles with summer tires must be equipped with snow chains on winter roads. The minimum tread depth for winter tires is 3mm for vehicles up to 3.5t gross vehicle weight. There is a winter tire obligation for heavier vehicles and then the tread must even be at least 5mm. There are also regional and date-dependent additional regulations. These are just a few examples.
Some of our nordic members could tell you more about the exact regulations. Maybe
@Bengt N @JeeperFIN or
@Todd Jackson ?
But if you take winter tires plus snow chains with you I recommend to practice the on and off this BEFORE in the dry. If it is wet, cold and dark, it is the wrong time to try around.
Take a look at the articles linked above, you will find a lot of useful information. If you have any further questions, I am happy to help.
Enjoy planning and your trip,
Bjoern