This is the website I used to determine if I should get the Mini 4 or
Air 2, Screen brightness and low reflectance were the key factors i used in making my determination.
iPad mini 4, iPad Air 2, and iPad Pro Display Technology Shoot-Out
This is a quote from that page about the iPad Mini 4:
"iPad mini 4
The iPad mini 4 is close to being a textbook perfect LCD display in all of the Lab measurements and viewing tests. Among the iPads it takes first place and is marked Best in every single test category except Contrast Ratio – where it has a Very Good but not the highest Contrast Ratio of 957 in 0 lux (because Apple didn’t provide a Photo Aligned LCD like on the
Air 2 and Pro).
Among all existing Tablets of any size, the iPad mini 4 takes first place and breaks performance records in many of the most important test categories including: lowest screen Reflectance (2.0 percent), Highest Contrast Rating in High Ambient Light (225), a near perfect Log-Straight Intensity Scale and Gamma of 2.22, and the highest Absolute Color Accuracy (Average/Maximum Color Errors of 1.9 and 4.2 JNCD – tied for first place with the
Microsoft Surface Pro 4). If Apple hadn’t intentionally made the display’s White Point so bluish (7,109K instead of 6,500K) then the Color Errors would have been even smaller.
There is just one qualification… if you will be viewing dark content or need perfectly dark Black Levels, then an OLED display like the
Samsung Galaxy Tab S 8.4 will perform much better than an LCD display.
The iPad mini is small but has a gorgeous display – unquestionably the best and most accurate LCD Tablet display that we have ever tested. If a 7.9 inch display is big enough, the iPad mini 4 is the best! See the
Display Shoot-Out Comparison Table for all of the measurements and details."