My mother's Samsung galaxy tab 2 10.1 is due for upgrade to something thinner and lighter (for travel away from home) but most available products also offer higher resolution screens capable of smaller text and menus that do not not suit her very bad eyesight. If all the default font, icon, etc. sizes can be set bigger then I could consider such a device but I would prefer a cheaper low-res but large 10" screen. The Samsung Galaxy Tab 4 10.1 has that but is unfortunately not very light/thin.
I went with Samsung because it has TeamViewer app QuickSupport add-on that helps me support her by enabling remote view/control of the tablet to provide assistance remotely as we live far apart.
iPad Air 2