Starting from left to right: The iPhone XS has the 5.8 size OLED screen. The iPhone XR has the 6.1 LCD screen. And lastly the largest iPhone XS Max holds the 6.5 LCD screen. From my observation, the iPhone XR seems to be a budget phone with the price at $749 starting out and only an LCD screen. While the iPhone XS and iPhone XS Max being the exact same phones, only difference is sizes and prices. iPhone XS is priced at $999 and iPhone XS Max is priced at $1099 starting out.