4G
I would go for the 4G iPad as this will give you the ability to file flight plans and get weather without using your iPhone ( a link that I have found unreliable).
The IPad GPS is quite good and as long as the GPS cover is OK it works accurately up to 500 Kts, that should give you sufficient margin for the (excellent) sky demon app.
The iPad works well as long as it can see the sky, it is faultless on my Robin and a B737-300 but occasionally drops of line in Cessna's and fails to work most of the time in B737-800's ( no eyebrow windows ) I suspect the reason for this is masking of the satalites by the airframe.
I am thinking of putting the iPad mini with a high class GPS receiver in my Robin when it gets an Avionic upgrade to use as an EFB, in connection with the Jepp view it gives the aircraft position on the en-route charts and automatically selects the taxi chart at the ground speed falls below 40 Kts !
Last edited by A and C; 31st Mar 2014 at 11:21.