Unless there's a particular reason to get a mini (portability, fits in something or other), I'd go with an Air 2 with 64GB. The 16GB model is just too small. Certainly there's no reason to get a Mini 3 over a Mini 2 if you were to go that route; it's $100 premium for one thing: touch ID. Not a big deal on a tablet.

I am the Doctor, and THIS... is my SPOON!