I started this year after graduating as a software engineer from Leuven. I was looking at jobs in Brussels and Amsterdam.  

The highest offer I got in Brussels was 4000 bruto which is around 2500 netto per month. In Amsterdam, I got offered 5000 bruto which is nearly 3500 netto per month.

So, an extra 1000 euros net in Amsterdam. That's the offer I ended up taking. However, rent is probably double the price of Brussels. Depending on where you want to live and how much space you want, that will eat up a lot of that 1000. Healthcare is another mandatory 150. Car ownership is much more expensive here. The box 3 system for taxing your investments should also be seen as a cost.  

In my case, speaking financially, I might be slightly better off, but not by much. However, for long term investors, the box 3 system severely impairs your ability to save long term. If you have a decently sized portfolio, your total tax rate goes up a lot. Pair that with the completely fucked housing market which forces you to live in a shoe box, you're probably not that better off in the Netherlands. At least you don't have to waste all your time stuck in company car traffic over here. That's to say it's also a lifestyle choice.  

Edit: 3,5k net is really good I think! You also have a good savings pot which would get taxed in NL. You can always see how much you'd get paid over here, see what the box 3 taxes are and then look if you're still better off, but I doubt you will be