Exterior walls 24cm hollow bricks: WDVS or Poroton T7?

To my knowledge, there is already a difference of a few dB? And longitudinal sound is not measurable/evaluable, but physically it is almost eliminated.

We had an ETICS installed as part of a renovation. If we build again, I definitely won't do that again. Styrofoam beads have spread all over the garden, and I'll never get rid of them all.

Manufacturer information

Perlite (42.5):
- T7 >= 43db (very precise indication...)
- T8 46.4db
- S8 48.7db
- S9 48db

Mineral wool:
- T7 48.3db
- T8 ? (no information found)
- S8 48.5db
- S9 49.3db

Unfilled:
- T18 24cm: 48.6db
- T14 24cm L: 46.8db
- Hollow brick 24cm: 54.1db ("Poroton-Planziegel-T 24,0-1,2 EB", soundproofing brick)
- T8 42.5: 41.2db => this should really be avoided
- T9 42.5: 42.7db

With T18/T14 including mineral wool ETICS, one should be quite well equipped against outdoor noise (this statement expressly does not refer to structure-borne noise!).
T8/T9 unfilled should definitely be avoided, the values are really not good at all.

Whereas even the unfilled T8 far exceed normal windows. These are at 32db and are the bigger problem.

T8/T9 unfilled should definitely be avoided, the values are really not good at all.

And yet 90% of the general contractors, architects, etc. recommended this stone to us even though I had said 100 times that it was sensitive ... with a 6000 euro surcharge compared to perlite and all sorts of horror stories about wet mineral wool, we unfortunately let ourselves be talked into it.

But honestly, the difference between 42 and 48 dB is not huge either. On paper, this is a doubling of sound pressure, but for the human ear, it is less so (+10 dB = doubling of loudness). +/- 3 dB is the average person's hearing threshold to even discern a difference in loudness. And as has already been said here, windows and doors are the real weak points. Inside the house, it is also not to be ruled out that sound bridges occur due to unfavorable constructions or simply poorly insulated penetrations. One would be ill-advised to blame everything solely on the choice of stone, only to see those advised disappointed by reality when, despite 40 cm of sand-lime brick inside and outside, they are disturbed by children's noise through the windows and the dryer noise through the downpipe shaft...