There is no "perfect" wind IMO - not even for the individual - when talking waves
The less wind, the better waves - longer, cleaner, better
The more wind, the better the waveriding ability with "standard" medium kitesizes like 7-8m2.
And even better with small kites like 4-5-6m2.
But the waves get worse and worse typically, and the surface more and more choppy
I prefer winds around the 7-9m2 size, a compromise with good wave ability (fast DTL kite handling), and clean waves
Meaning winds around 16 to 21 for the 9m2, and 21 to 25 knots for the 7m2 (@78kg)
A good 4 or 5m2 wavesession is great - but can be a bit choppy. Happens quite often.
But a big kite session with 10-11m2 can also be great - with the most beatiful clean green waves and sunny
If I could only have ONE windspeed (and kite) always and had to choose, my pick would be 22 knots and an 8m2
Goes with "everything"