LG G Pad 8.3 GPe vs. iPad Mini Retina Display

Does anyone have direct experience with these two tablets? I bought a retina iPad Mini last week, and I actually dislike iOS quite a bit. I've used iPhones and iPads before, but my last interaction with them was years ago. Now that Android is up to Kit Kat, I find that the OS itself is far more streamlined and easier to use. Simple things such as a persistent back button make a big difference; having to reach up to the top left of the iPad to go back is a chore IMO. From a hardware perspective, the iPad mini is awesome - I love the screen and the body, but the actual OS is the limiting factor for me.

With that said, has anyone used the G Pad 8.3 GPe who has also used the iPad mini? What are your thoughts? Which do you prefer, and why?