The iPhone 6s and iPhone 7 come with identical screen sizes: 4.7-inch Retina Displays on the iPhone 7 and iPhone 6s and 5.5-inch Retina Displays on the iPhone 7 Plus and iPhone 6s Plus. They might look the same on paper, but there are some tangible differences.
First off the iPhone 7 features a wider color gamut which means the photos you take and the photos you view look better than they do on the iPhone 6s.
The iPhone 7 display is also 25% brighter than the iPhone 6s, which helps with viewing the phone in bright sunlight.
If you want some more in-depth analysis, take a look at DisplayMate's iPhone 7 display shootout. At the time, the iPhone 7 had the "highest peak brightness for a smartphone" and is actually brighter than advertised.
If you use your phone outside or want an extremely bright screen while viewing content in the dark, go with the iPhone 7.
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