Another key difference between the iPhone X and iPhone 11 is screen technology. The iPhone X is the clear winner in this category because it has a higher resolution display with better build quality. While the iPhone 11 dons a larger LCD display, the iPhone X features a more compact OLED display with a 2,436x1,125-pixel resolution, which is higher than the iPhone 11's resolution (1,792x828). In general, OLED displays serve up better image quality with blacker blacks and whiter whites, but they're also more costly. When I compared the iPhone X and iPhone 11 screens side by side, however, I didn't notice a difference in quality, in both dark mode and normal.