iPhone XS:
Smaller Screen (5.8)
Higher Resolution (458ppi)
Wide+Telephoto lens
Portrait Lighting w/5 Effects
HDR screen
OLED
IP68 Waterproofing
Gigabit LTE
Shorter Battery (compared to XR)
3D Touch
Smaller, Thinner, Lighter
$1000
iPhone XR:
Bigger Screen (6.1)
Lower Resolution (326)
Wide lens
Portrait Lighting w/3 Effects
No HDR
LCD
IP67 Waterproofing
LTE Advanced
Longer Battery (Compared to XS)
Haptic Touch
Bigger, Thicker , Heavier
$750
Some Unknowns: Wifi speeds (2x2 vs 4x4 MIMO), RAM
Missing anything? This is just looking at 64GB models, obviously different size models available between the two.