TILE CHOICE
Ceramic, glass and porcelain tiles are inherently very slippery when wet.For use on floors can be made more slip resistant either by using very small tiles so that the grout lines acts as grooves or by imprinting a contour pattern onto the face of the tile.
Ceramic tiles typically have a glazed upper surface and when that become scratched or pitted the tile looks worn, where as the same amount of wear on stone tiles won't show or will be less noticeable.