I'd agree with Warren. I must admit I was surprised to see you using the term 'Netherlander' in a discussion yesterday. I've never heard this before, and I'd be tempted to say that it doesn't exist. It looks very strange to me, and I did wonder where you had heard this term.
The country itself may be referred to as either Holland or the Netherlands, but as far as I know, the only English demonym is 'Dutch'. Nor am I aware of any issue of political correctness. The word Dutch originates from a vagueness and confusion around the Dutch and the Germans, but 'Netherlands' is equally imprecise, as the term 'Low Countries' traditionally also includes Belgium/Flanders.
If I were you, I'd stick with 'Dutch', but - in the interests of political correctness - let's wait for someone from that country to tell us foreigners what they would like us to call them.