I came across a post by Alex Shogren, founder of Best, a couple of months ago on kiteforum. His stats are open to interpretation and it could be argued that they favor Best

but interesting none the less...
2007
Kites sold worldwide +/- 130,000
Market share in terms of number of kites sold
Best 22%
Cabrinha 18%
North 12%
Naish and Slingshot +/- 8%
The rest make up 40%, none of which have more than approx. 4%, except Takoon with approx. 5%.
If they have any truth to them, then according to what you have said above, there's one heck of a lot of "less experienced" riders out there!