Why kites can have different lengths in the lines? Any expert in kitesurfing?

Question

Some kites have 18, 20 or 25 metres lines

What's the response of the kite to the different lenght in the lines?

Answer 1

short lines make the kite fly faster but long lines slow it it down and gives you a lot more power

Answer 2

obviously kites come in all sorts of shapes and sizes and weights. Longer lines can be used for heavier kites and can get much more life but can be harder to launch and control. Shorter lines are the reverse (not as much fun)