As a titanium engraving marketing guy, I'd argue that my technology is younger and even less proven than ceramics, but I'm going to bet it's more durable than engraving in stone.
The technology is probably superior, but there's a conceptual flaw that is titanium being a valuable material. This results in a risk that data gets erased and the carrier material turned into jewellery, prosthetics or other funky stuff.
Clay tablets were often wiped and re-used. A lot of the ones we have preserved were preserved because the buildings used for storage burnt down, hardening the clay tablets and preserving the writings.