My iPad 3 (9.7") is getting slow and iOS 9 didn't do it any favours. It has some noticeable lag and it really hinders its performance. Takes ages to turn on, multitasking is slow and it doesn't have Touch ID . On top of all that, it's quickly becoming outdated and on the verge of being unsupported by Apple. I've been thinking about getting the new iPad mini 4, and while screen size isn't an issue, I'm wondering if it is better to go with the Air 2 instead? I'm looking at the 64GB mini which is £399 - the same price as a 16GB Air 2. Need some advice. Many thanks in advance.