I started off using my iPhone7, works great but I wanted a bigger screen. Looked into the iPad
Mini 4, but the new ones cost more than the 2018 (6th gen) iPads, and I had no luck finding a good condition used one. I so bought the new 9.7” iPad from Costco ($399 for the 128GB model) and it works great, love the big screen. It has the exact same CPU as my iPhone 7 so no performance issues. I’m using the MavMount to secure it to the controller. I like the balance, and the ability to set the controller down with the iPad mounted and not worry about it tipping over.