Funny the confusion about Ion-X vs Sapphire, it's very simple.
The Ion-X is less brittle, therefore it is more shatter resistant BUT it's less hard at the same time meaning it takes damage easier leading to fracturing sooner than an equally used Sapphire setup with the same abuse. A threshold of fracturing for each material is needed to shatter; the X-Ion fractures easier but needs more fractures to reach the point of a shatter. The Sapphire on the other hand is harder and thus gets fewer fractures for the same abuse as the X-Ion, and while it might take fewer fractures to shatter, it DOESN'T get the fractures at the same rate as the Ion-X in the first place and therefore in general use will shatter later in use than an Ion-X. A significant blow will shatter Sapphire a bit easier than Ion-X, but that is not typical use, the more likely case is the Ion-X will accumulate more fracturing and with a less traumatic blow will shatter sooner in use than Sapphire.
The problem is the general public equates fracturing and shattering, and one (shattering) is a result of the other (fracturing).