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Both the iPad Air and the Kindle Fire HDX comes with what is universally known as 'retina' displays, that is, a display where the pixels are so small that at normal viewing distances they cannot be made out.
- The iPad Air is equipped with a 9.7-inch 2048-by-1536 resolution display with a pixel density of 264 pixels per inch.
- The Kindle Fire HDX comes with a 8.9-inch 2560-by-1600 resolution display with a pixel density of 339 pixels per inch. The panel is also described as offering perfect color accuracy (100% sRGB).
Technically, both displays fall into the 'retina' category, which means that at normal viewing distances the pixels will be too small for the human eye to make out. However, the higher pixel density of the Kindle Fire HDX means that you can hold the tablet closer to your face and still get a 'retina' experience.
So, if it's size you want, the iPad Air is for you, but if quality is what you are after, then you should opt for the Kindle Fire HDX.
(Image source: Apple and Amazon)