Polystyrene or mineral wool in winter

Believe so.
It is definitely fluffier :D

Hello Andreas,

usually yes. Then these [Tropscheiben] have to be slid on, not a big effort either. It holds.

I think so.
It's definitely fluffier :D

Belongs at the very top of the pro list :-)

Clearly mineral wool. If the construction takes two weeks longer because of the weather, it doesn’t matter at all over the next 30 years. Polystyrene has its advantages, but I would only use it if there is no other way/sense.

The mineral wool must tolerate water. It can always get wet, even later ...

That is not quite correct. Especially with mineral wool, moisture spreads over a large area (capillary effects). Problems with mold are not uncommon with severe wetting. So a little rain while the shell construction is being raised is not a problem, as long as the last row of bricks is covered; double-wall masonry left open in continuous rain: not a good idea. Rhenish greetings

My opinion: The material that your construction company is more familiar with. Good workmanship is significantly more important than the chosen material. Both serve the same purpose, see no particular advantages or disadvantages that affect you.