Sand-lime brick vs. pumice for masonry?

Then I would take KS. Simply a matter of personal taste

With only a 2% difference, I would also choose KS plus WDVS. In my opinion, it has almost only advantages compared to aerated concrete.

In my opinion, it has almost only advantages over aerated concrete.

Pumice is not aerated concrete at all, but I already mentioned that. However, I see the difference here very much on a matter of taste, so that I couldn't find the sand-lime brick worse – and it isn't anyway.

With only a 2% difference, I would also choose KS plus ETICS. In my opinion, it has almost only advantages over aerated concrete.

Both would be stone plus ETICS. It really only concerns the stone itself. 20cm pumice or 20cm KS. Statement from the shell builder: they differ only in color, and plasterers prefer pumice because they don't have to prime it as extensively.

Let's check if the KS is sufficient at 17.5cm, possibly in a higher RDK.