I have surface 2, Asus vivotab( which I am selling) primary uses: Sky go, work related bits, internet browse and food buying etc. Some games like hungry shark evolution!
Selling Asus vivotab cos I felt the two core to be a bit under powered, it is such a nice device too!
I used apple ipads in work, they were good idea and glad surface and other tablets came out. The apple items are for essentially kids, there are officially business apps however it feels like a device to play, browse more than productivity. I hate apples bad ui, someone gave me an iphone 6 to take photos had no idea how to! Unless isheep for life that is a bad thing!
With android I felt a more mix between games and productivity, the lag however puts me off I keep wanting to buy one, just irritates me. The note 4 with 805 ( I know phablet) is a lovely device that's quick! I want that snappyness in a droid! I do not think though I would root a droid though so many apps don't like this! The ui is good I do not have a problem with taking a photo on it or anything.
Essentially being a windows/ phone user, I think I come to expect speed, games, productivity. I love the fact 8.1 is synchronous between phone and pc/laptop/tablet and ui is was to pick up!