Wait for OLED Across the Board
The iPhone XS and iPhone XS Max both come with beautiful OLED displays (they're two of the best screens ever made) while the cheaper, more colorful iPhone XR comes with an LCD display.
Apple is reportedly using the same setup on its 2019 iPhones which means you can expect a lower-grade LCD display on this year's version of the iPhone XR. That could change next year.
According to The Wall Street Journal, Apple is planning to ditch the LCD display in 2020 and use OLED panels across the board. This isn't the first time we've heard this rumor so it's trending in the right direction. A more recent report from Digitimes backs this up. So does a report from Kuo.
The iPhone XR's LCD display is good enough for many people, but the OLED display is the clear winner between the two.
According to DisplayMate, the iPhone XS Max has the best smartphone display to date. It's brighter, it packs in more pixels, and it provides greater color accuracy than any previous iPhone display.