We are often less guessing about the size of the kiteboarding market and popularity of brands.
If Google tells us anything based on their search trends, overall interest for Kitesurfing has been declining 10 years in a row! The searches seem to be seasonal and mostly come from Europe, North America and Australia (no surprise here).
Looking at the popularity of the brands, Cabrinha is the number 1. However the overall number of are declining, so this could point to a shrinking market (no wonder they raised their prices this year again).
Surprisingly hydrofoil only has seen a small bump in popularity over the past couple of years.
While surfing is also on the decline, Stand Up Paddle has taken over Kitesurfing in number of search terms.
Check it out for yourself here: https://www.google.com/trends/