Honest question from the Czech guy. Is there some significant difference between the Swedish and Finnish development systems regarding harder/easier transition to NHL? Maybe it's just my perspective as Swedes transfer to the NHL more easily.
I don't have that detailed information about how Swedes do their things, so I'm the wrong guy to answer that question for you, but I'm sure there are wiser guys here on these forums that can answer that question instead better.
However, it's certain that Swedes got more money involved in their league, Swedish Elite League compared to the Finnish equivalent, Liiga. More money often means better professional coaches and players hired. If a junior player in Sweden is very high level, he can practice and compete with better players and have better coaching before going to the NHL. Then the gap to NHL isn't that big anymore. By better coaches, I don't mean that Swedish head coaches are better than Finnish head coaches, but the overall structure of the coaches and the coaching system might be different because of budgets. Also more coach personnel in Sweden possibly, is my guess.
Play style wise, I think that Swedish hockey focuses more on skating, while in Finland/Liiga, it's more tactical and in some ways slower. We know how important skating is in NA, so transferring there should be easier because of that.
One other thing I can think of is that Liiga is a closed league at the moment in terms of promoting & relegating teams. So no team can rise to the top level from the first division. It has been closed for a very long time and many people think that it's causing damage to Finnish ice hockey in many ways. The deciders are planning to open the league very soon though. In 1-3 years if I can recall.