And the cost factor is, I think, not to be underestimated...
That's also why I say aluminum.
And then for 6,000 euros instead of 3,000. In addition, you are rewarded by the fact that the color of the plastic windows often does not come in an aluminum version, and therefore you do not get the same shade.
As a former aluminum window manufacturer, I consider both to be myths. Different burglary resistance classes dominate the market segments of aluminum and plastic; your price example compares premium custom work with DIY store pallet goods. And there are no colors that do not exist (in glossy or matte). However, that cost us quite a bit as well, unlike other suppliers who say these eight shades, a ninth one does not exist at all or only at a deterrent price. By the way, our best-selling (about 20% share) was matte white.