95% of the time, whichever model is standard at the time is the best one to get (currently we’re selling the iPad 2018 32GB). Going for an older, refurbished device is a small cost saving, but the device won’t be compatible with iOS upgrades for quite as long and you may find that this affects your ability to download the latest updates of the apps you need (for example, the latest version of Predictable is only available on iOS 10.0 or later).

Choosing between an iPad mini, a regular iPad and an iPad pro is a matter of personal choice and really depends how you plan on using it. iPad minis are light, and consequently the most portable; but a bigger screen makes buttons more visible, and a larger target, which reduces frustration from mishits.