Density is the practical difference
Porcelain is fired denser and absorbs less water than standard ceramic, which makes it harder, more frost-resistant and better suited to floors that get genuinely wet. Ceramic is softer, easier to cut, and often perfectly adequate on a wall or in a low-traffic bathroom.
For a floor that takes wet boots and grit, porcelain is usually worth the difference. For a guest bathroom that sees light use, a good ceramic is not a compromise.


