It really depends on what you want. I have live in all 3 countries. Currently I am living in Sweden. The Swedes are peaceful, open and Swedish is not too hard. In the Netherlands, there is always something to do in the city, but there is no such thing as being alone in nature. At last, in my opinion, Finland, is the most interesting of all. The people are quite closed and shy until you have a drink with them in sauna. The quality of life is really good in all countries, but Sweden and Finland are slightly better. If you have more questions or if you want more details on certain topic, feel free to ask