I have used both, and concur with msinger. I have also used a Nexus 7 android which worked well but the IOS is better, smoother and has never crashed or shut down in flight.The slightly larger ipad screen is also useful. I am not an Apple fan,quite the reverse, but the ipad mini4 gets my vote, it gets the job done.
One point to bear in mind, most ipad minis do not have a built in GPS chip, only the cellular ones have this, you may need this for certain flight modes, you can tether a non cell ipad to phone which has GPS. You can use the cellular version without a contract, it still works. I am in UK and just buy a 12 month 12GB data sim for the ipad, and throw it away when it expires.