Go with KitKat 4.4 on Sony's phablet.
It was a big day for the Google Play Store's device section, as the Sony Xperia Z Ultra is now available as a Google Edition phone and the LG G Pad 8.3 as the first Google Edition tablet. Essentially, it's the same Xperia Z Ultra that we've talked about before, but this time it's running that oh-so-sleek stock Android 4.4 KitKat.
The Xperia Z Ultra packs a 6.44-inch full 1080p HD Triluminos display at 326ppi and, similar to the Galaxy Note, is actually better described as a phablet as opposed to a smartphone.
The device measures 6.5mm thick and packs a 2.2 GHz quad-core Snapdragon 800 CPU, 2 GB of RAM, 16 GB of on board storage, microSD card support for expansion of storage, an 8-megapixel camera, support for 4G LTE, and a huge 3,000mAh battery. Of course, you couldn't call it an Xperia Z without the waterproof feature. As such, the Xperia Z Ultra is also waterproof to 1.5 meters for up to 30 minutes, and is dust resistant, too.