Polystyrene or mineral wool in winter

We are currently constructing a KfW40 new building using solid construction methods. The following is planned for the exterior walls: on the inside aerated concrete, then 160mm insulation (WLG 032), an air layer, and finally clinker bricks. Our contractor typically uses mineral wool as insulation. Since our house is being built over the winter, the contractor recommended using polystyrene with the same characteristics (160mm, WLG032) instead to avoid moisture problems during the construction phase. Of course, mineral wool is never installed in the rain and is always covered with tarps, but here in the North, the wind can sometimes tear off a tarp over the weekend, and then the mineral wool would get wet. The argument basically seems plausible to me, but ultimately the decision should be ours. In terms of price, the quality would be comparable. However, I would like to hear your assessment.

Pros of mineral wool:
- Does not burn
- Easier to dispose of
- Better heat protection in summer due to more mass (also relevant with our wall structure?)
- Better sound insulation (also relevant with our wall structure? Rather quiet area...)

Pros of polystyrene:
- Insensitive to moisture, resulting in fewer problems and possibly faster construction

Have I overlooked anything? How would you decide?

The mineral wool must withstand water. It can always become damp, even later, because the dew point is on the inside of the bricks.

It will probably be core insulation - hydrophobized. I would stick with mineral wool. If it gets damaged, the contractor has to replace it. Mineral wool isn't that sensitive anyway.

Mineral wool is also significantly more expensive and much more difficult to process. You simply glue polystyrene to the wall, wool is doweled. The suggestion might come from that... If the general contractor really finds processing mineral wool too complicated in winter, that doesn't reflect well on him... Has he ever built a house before or is yours the first...? ;)

Best regards,

Andreas

The mineral wool is only pushed onto the masonry anchors in clinker construction. I also suspect that the contractor wants to save money.

@ Firecrackers:
Is it really just placed on the wires and done? And it holds? Learned something new today...
Then the processing probably won't be much different.
It would still need to be checked whether the material is more expensive.

Best regards,

Andreas