The reviewer is clueless, and so is the Apple shill talking about "theoretical" specs in the comments section. The Note 8 is HDR certified, which means it HAS to meet certain specs. Display Mate TESTED the display, and measured ACTUAL results. Conclusion? Note 8 is king. From their test:
The Galaxy Note8 is up to 22 percent Brighter than the Galaxy S8. For most image content the Galaxy Note8 provides over 490 cd/m2(Luminance, which is a measure of Brightness sometimes called nits), comparable or higher than most LCD displays in this size class. The measured Brightness on the Home screen is even higher at over 540 nits. When the display Brightness is set Manually with the slider, it can be adjusted to reach a maximum screen Brightness of up to 728 nits, which is impressive. See the Screen Brightness section for the measurements and details.
The measured Galaxy Note8 Screen Reflectance is 4.6 percent, close to the lowest that we have ever measured for a Smartphone. Our Contrast Rating for High Ambient Light quantitatively measures screen visibility and image contrast under bright Ambient Lighting – the higher the better. As a result of its high Brightness and low Reflectance, the Galaxy Note8 has a Contrast Rating for High Ambient Light that ranges from 88 to 158, the highest that we have ever measured for a Smartphone. See the Screen Reflectance section for the measurements and details.
· Even Higher Automatic Peak Brightness
On the Galaxy Note8 the Maximum Screen Brightness can go much higher when Automatic Brightness is turned On, so that users can’t permanently park the Manual Brightness slider to very high values, which would run down the battery quickly. High Screen Brightness is only needed for High Ambient Light, so turning Automatic Brightness On will provide better high ambient light screen visibility and also longer battery running time.
When Automatic Brightness is turned On, the Galaxy Note8 produces up to a very impressive 1,240 cd/m2 (nits) in High Ambient Light, where high Brightness is really needed – which is the brightest Smartphone display that we have ever measured, and 22% Brighter than the Galaxy S8. As a result of its very high Automatic Brightness and low Reflectance, the Galaxy Note8 has a Contrast Rating for High Ambient Light that ranges from 122 to 270, also the highest that we have ever measured for a Smartphone display. See the Brightness and Contrast, the High Ambient Light and the Screen Reflections sections for the measurements and details. The much higher Peak Brightness of over 1,200 nits is also used to provide High Dynamic Range HDR, which we discuss next...