"There just was a debate on BBC World and a representative of Slovenia said that NATO was a more seducing short term international western organization to join (although it never was used during the cold war era).
But the EU, in the long term, is indispensable because it's about our every day life, our well being and besides, it's a peaceful construction."

Why do you seem to be comparing these two? Are they any conflict between them- what is the disadvantage of joining NATO?
[Is the required amount of miltary spending seen as a challenge/burden to any existing or potential members?]
Btw, one requirement of being a NATO member is the country must be a democracy, does a EU member also have this requirement?