Single-skin vs. double-skin facade

From a practical point of view, I consider clinker to be clearly ahead because it does not need to be repainted. In my circle of friends and family, the clinker is also not cleaned or anything like that. With a plastered facade, it eventually looks terrible and probably needs to be repainted.

: I'm not an expert, but I would say that there are indeed differences. Moisture that is generated inside the house is mostly removed by ventilation. A small part, however, can be absorbed by the plaster and transferred to the underlying rear wall. Through the ventilation behind, the resulting condensate can then drain away. I know we are talking about small amounts here. But it is often said that houses insulated with ETICS and without a ventilation system have worse indoor air quality. I spoke with a master painter a few days ago. He said that conventional ETICS systems are a disaster from his point of view. The mortar needed for fastening is applied only in stripes on the sides and in the middle. Condensate would form behind it and over time lead to very pronounced mold growth.

What Tobias writes is also confirmed by my brother, - master painter -. Therefore, if single-layer, then without ETICS, without polystyrene panels. This is possible with certain Ytong or Porit stones. You then have a thick plastered aerated concrete wall. This is not prone to mold.
Painting the facade after a few years remains necessary. But honestly, even a brick facade requires renovation over time. It is the joints that loosen and need to be repaired. Nothing lasts for decades without inspection.

With clinker bricks, I see the need for renovation after at least 30 or 40 years. The normal mortar joint is very durable. A splash guard strip with gravel is, however, mandatory.

[...] A splash guard strip with gravel is mandatory.

What is that, if I may ask? Like a gravel strip around the house, so that rain dripping down doesn’t splash soil onto the house wall?

What is that if I may ask? Some kind of gravel strip around the house so that dripping rain does not splash soil onto the house wall?

Yes. Exactly.