The RS 14 Day Best of Scandinavia tour "only" covers three countries with overnight stays in seven cities/towns and is orchestrated and supported by a professional guide and bus driver. You are considering five countries in 14 days seeing a mix of urban and rural etc. Are you looking for an "If it's Tuesday This Must be..." kind of tour?
We have done mostly self-organized/guided tours mixed with guided tours and have concluded that self-guided tours are more relaxing but only see/do a half or less of what an organized tour patron sees/does. If you really want to get out and walk about exploring City life and rural nature, you should concentrate on two countries plus Copenhagen.
Sweden: The one Scandinavian country I have yet to visit.
Norway minimum: Three nights in Oslo (meaning two full days), Norway in the Nutshell train Oslo to Bergen with at least an overnight stop in one of the Fjord villages en route. Two nights in Bergen (one full day). [Depending on your interest, the Norwegian Mountain e.g. Jotunheimen could be a must see/do.] Fly to Copenhagen
says it distinctly:
Norway is large. Far larger than most people realize. We recommend you
take your time as you travel, and enjoy the scenery, the food and the
culture along the way. As they say, sometimes the journey itself is
Having just visited Copenhagen this past January, our three nights in Copenhagen was in my way of traveling, the minimum time to experience the town and doesn't include travel to rural Denmark.
Mixed feeling about Finland. Finland is sort of off the beaten path and sort of not Scandinavian. Yet I loved our two visits to Finland the first combining Helsinki and Lapland, the more recent Helsinki and the Lakeland central area of Finland. Helskinki's tourist sights are pretty compact and you could touch on them in two nights (a full day), but three nights would be more relaxing allowing you to visit the open air folk museum and take the ferry to Suomenlinna:
And a third night would allow time to take the fast boat to Tallinn.
You will need to pick and choose, cutting it down to two countries plus Denmark/Copenhagen. This would be a hard choice if this is your only lifetime trip to Scandinavia/Northern Europe.