https://wccftech.com/iphone-xs-max-best-smartphone-display-displaymate/

The iPhone XS Max and iPhone XS both feature a 120Hz touch sample rate OLED screen that would have improved upon a little ever since Apple gravitated to using this display technology on the iPhone X. Now, display calibration experts got their hands on the larger variant of the two and state that the 6.5-inch flagship sports the best smartphone display right now.

According to Dr. Raymond M. Soneira, President of DisplayMate Technologies, the bigger iPhone XS Max has improved considerably, as it now boasts a peak full-screen brightness of up to 660 nits for the sRGB and DCI-P3 colour gamuts. This helps to improve screen visibility in high ambient lighting conditions. By comparison, the iPhone X achieved a peak full-screen brightness of 634 nits when it was reviewed by the same experts a year ago.