Which stone / brick to use in solid construction

Maybe revise the wording once more? It's not really clear what is meant. Noise protection is important? Thermal insulation must be met anyway. The best noise protection is provided by [Kalksandstein] or concrete.

So, because we are buying a property near the railway, I would like to somehow reduce this noise. I want to have some peace inside the house. Therefore, I would like to know which building block is best suited for this. (I have read that [Porenbeton] is not good for sound insulation).

Exactly. It has mass instead of air and that dampens the sound,- is combined with an external thermal insulation composite system or clinker.

Thank you very much for your answer. Do you happen to know if they are still better than filled bricks or not? And are they also expensive?