Display and Screen Size
Size always matters when it comes to Apple products, and you'll certainly be paying a premium for the iPhone X's Super Retina Display, which spreads out across the phone's 5.8in screen. The X is also set apart from the other devices by offering Apple's first OLED screen, which helps maximize the vividness of color.
The iPhone 8 Plus is big, but not gargantuan, offering a 5.5-inch screen, while the iPhone 8 is decidedly smaller at 4.4in. The X also provides a high enough pixel resolution to put you in a trance, and unlike the iPhone 8 and 8 Plus, boasts a High Dynamic Range — which is said to elevate visuals captured on a smartphone to a new frontier.