I like my blacks black and the Xr screen has a lot of punch. The whites are white, the blacks black. The Xs screen on the other hadn't is silky smooth and richer tones. I took a side by side shot with iP6s which actually managed to capture the relative difference and the difference in screen is very noticeable. I should have taken one with flat white and text web page, since I do a lot of reading, I think I preferred the Xr colour rendering and default size rendering for reading. Xr right, Xs left.