Many Italians and Spanish are sold basically a scam believing that moving to the Netherlands for the same job they can do in their home country will let them make more money. Given the housing crisis in the Netherlands and the more hostile and not healthy climate you will find yourself making probably just a couple of hundred euros more per month while having to make a lot of sacrifices that you would not have to make otherwise in Italy or Spain. For example, Let's assume you move from a smaller Italian/Spanish city (population 200k-300k) or smaller towns around them (population 5k-15k) to an equivalent place in the Netherlands. You will find yourself making probably 100-200 euros more (if you have no health inconveniences or things not covered by the insurances you have) but you will have to live in a place that is probably half the size of the apartment/house you could afford in Italy/Spain. You will also have to deal with a form of healthcare that is very different and in contrast with most western healthcare, and will find yourself spending money out of pocket to get chrckups done abroad. You will also risk having a poorer diet, since quality produce is way more expensive. You will also eat/drink out less, because restaurants and cafes have ridiculous prices. The only way to have it make sense is being in a field that is highly sought after and pays more than twice net what it would pay in Italy or the Netherlands.

I have Italian friends that moved to the NL and some that stayed that have very similar jobs. The ones in the NL live in small, cramped 40sqm apartments, cannot even consider having children or buying a home, have to obviously spend a lot more on vacation because no place with decent weather is nearby, and similar things. My friends in Italy live in 80-100sqm apartments, they are starting to have kids, and in the end they save just 100-200 euros less per month than the ones in the NL, and cam go to the beach in the summer by just spending gas money for the car (which you won't be able to afford probably in the NL). Consider this very carefully and don't fall for the PR. Try to make some accurate calculations before deciding.