4 Display Quality
In addition to their physical size disparities, the iPhone XS, XS Max and iPhone XR also differ in their use of display technologies. The XS and XS Max both feature more premium active matrix organic light emitting diode (AMOLED) displays — dubbed Apple’s Super Retina AMOLED — which clock in at 5.8- and 6.5-inches, respectively, and boast Apple’s highest pixel density on a mobile device of 458 ppi.
iPhone XR, on the other hand, boasts a more modest (albeit updated) IPS LCD panel, which Apple borrowed from LG and re-engineered in-house, calling it the first Liquid Retina Display (LRD). It clocks in right in the middle of the iPhone XS and XS Max at 6.1-inches, and touts a lower-end pixel density of 326 ppi.