A lot of planes get built in joint ventures because most of these countries couldn't afford to design and build them alone.

Why do you return the ones you've tried? What's wrong with them?

I have some Sony WF-1000XM4 and they're ideal for me, wireless, excellent noise cancelling, sufficient audio quality for the money. With sound gear there'll always be something better for more money and less convenience, depends how much of an audio snob you want to be if the market leader's offerings around the £300 mark aren't good enough for you.