No worries, here we go
A waist is better for boardoffs, a seat for deadman like tricks.
With a seat you can hold more power in the kite.
The bigger, the better!
You need power in the kite to fly!
And it should be slow turning!
You will see that the faster the kite the less tricks you will land.
If you want to do big air, then stronger winds and small kites work.
Airstyle, with more tricks, will be more glide and kite control over height and non forgiving mistakes