XS & XS Max
Basically you're getting a gorgeous OLED screen, an extra camera for optical zoom, and a 4x4 MIMO for LTE. The rest of the phone is essentially identical to the XR. That isn't anything to sneer at since everything inside is improved over last year's X and the rest of the phones out there are still trying to catch up to Apple of 2017.
You get a great LCD screen but no haptic touch and just a 2x2 MIMO like in the past. You gain a neat new assortment of colors but don't most people put the phone in a case?