Frankly, from what I've seen, when it comes to tablets Apple can't be beaten. I generally dislike iOS, especially on phones, but all Android tablets I've used so far (admittedly primarily at work) were simply inferior to the Air 2. The only reasons I'd consider a Z4 Tab over it are a) my fear of random droplets destroying my expensive toy and b) Apple's extortionate pricing of internal storage (all hail Marshmallow).
One of the most important tablet apps for me is ps4 remote play, which does not have an iOS app. I actually prefer iOS multiwindow to Samsung's but the main thing I use a tablet for are the remote play, web browsing, and streaming video. With all these in minds, I don't a shit about the iOS's app selection, even with gaming.