What iPad for the cockpit? I am planning to pass my PPL and I am trying to buy everything I can before starting the flight lessons to spread the expenses. Most of the private pilots I have met told me that an iPad is almost essential for them now. But I am not sure which one should I take? An iPad Mini seems more than enough to me and the small size would help in small cockpit (like in a 152).
4G or Wifi-only, is 4G reliable at those altitudes?

Thanks !
In my experience, 4G is not reliable above 1,000 feet, and is frequently non-existent above 3,000 feet.

Many pilots have suggested the 4G model for two key reasons:


The 4G model has a GPS-chip in it, that the WiFi-only version does not.
Having a cellular connection means you can do on-the-ground operations in places that don't have WiFi. This includes things like: File Flight Plans, Check NOTAMS, and update maps and charts


Personally, my iPad is WiFi only, and I pair with an external GPS receiver for great accuracy.

I use the "regular" iPad (9.7"), but that is a little bulky in the cockpit of a 172.  The Mini may be preferable if space is at a premium.