The first and third are basically the same, but the pinky finger is slipped down a little further to support the phone... I hold mine like the third.
I hold mine like the second quite a bit
Might be easier to compare if they were all in the right or left hand.
I have a note 2 so use both hands (+feet)
Is it hard to type?
When I need to type, I tend to hold in both hands and use both thumbs.