FWIW: I use the 8" Samsung Galaxy Tab S2 (I paid $250 with 32GB capacity) with internal GPS chip. I added a 64GB SD chip ($15) for a total of 96GB of memory. The display is SUPER bright and it doesn't overheat as easy as the iPads do. I have it connected to a USB charging port on my panel so it never runs out of power.
I run the free FltPlanGO app which gives me geo-referenced maps, charts, plates, checklists, Weight & Balance an lots more. I also have about 40hrs of music on it wired to my audio panel. This set up works very well for me. YMMV