I suppose majority is cultural difference. Finnish people are usually pretty quiet and reserved, while Spanish people have close family and friend connections, also with the community.
Also people are less authority-obedient down south. The government has not helped the people before, so promises are not taken seriously. Banning singing and dancing in the streets got rid of most of the culture, hopefully it will return someday.
Surely the farming is way easier with warmer weather conditions, in Finland you get one harvest a year. So the food will not be the problem in Spain, in Finland it might become pretty scarce.
So also the paycheck does not matter, if there is nothing to buy. Tiny economy like Finland seems to get the short end of the stick.