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Choosing a smartphone?Difference between Android OS 4.2 and Android 4.4

kitkat is  leftmost while jellybean rightmost side





Navigation bar
 In Android 4.4, the navigation bar is displayed in immersive mode. This means that the navigation bar is translucent regardless of the applications being used and blends with the application colour. It is also customisable. In 4.2, the navigation bar is opaque and has black colour. Moreover,it is not customisable.

Compatibility
“Android 4.4 is designed to run fast, smooth, and responsively on a much broader range of devices than ever before — including on millions of entry-level devices around the world that have as little as 512MB RAM.”

Google Now
In some devices, Google Now can be accessed from the lock screen, or without touching your device all with voice activation on Android 4.4.
It enables users to enjoy services such as weather information, launch an application like Google Maps, play music, browse the web through voice activation.
In Android 4.2, the Google Now has to be downloaded from Google Search.

Music
In Android 4.4, Lock screen allows users to browse through all songs or movies from the lock screen. In Android 4.2, this function is limited whereby, a user  controls and skips to the next track in Google Music.

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