I think for teams like Porto, Benfica, etc. they don't have the money to compete with the rich European teams, which is why they rely on scouting young South American, African and even Mexican players for their squads. It is inevitable that those that reach a high international pedigree will leave for the top four leagues eventually. As for your question, I only watched two matches of Euro16, including the final. Portugal were not necessarily boring but they were on their heels for most of the match, France lost the game mostly because they let frustration overtake them. I did hear their matches against Poland and Austria were complete borefests. So I would say I enjoy Chile far more, hopefully the Chileans big four of Sanchez, Vidal, Medel and Bravo are still at their best for WC18. If that is the case, they should get far in the tournament.