It drives me up a fucking wall when clients want iPads for their retail spaces. You are locked into their limited form factors and premium pricing for a device that will likely be locked down to extremely limited functionality. Android tablets come in any size and shape for half the price and are easier to manage from MDM software. You can also just buy large touchscreens with USB ports that can plug into whatever. They all look the same when they're anchored to a case or kiosk.