With the sawn stones, I also find it exciting with perlite-filled ones. If you saw through a chamber, the entire perlite of that chamber falls out and the stone is then uninsulated there?!
How close to the street do you live that you notice it?
I have a lightly trafficked local road 300m away. But that’s not the problem...
My own heat pump (outdoor unit), a new residential area with endless kids, air traffic at 4000m altitude, etc. pp... there are dozens of other sources of noise in the countryside besides cars.
Where do you want to know that from? The filled stone has more dB because of that I would take it... The breaking didn’t matter at all, by the way, and hanging things up has also been easy so far... I don’t have kitchen cabinets on the exterior wall, though...