Not sure i've ever seen an official count. I think Wilson were leading at one time, which to some degree makes the count redundant. It goes back too far to be relevant today.
The unpaid #playednotpaid story is a whole bigger world though. Seems to cut through all the sponsorship and TC ad bluff. Lots of media picking up the story - especially as the US Masters winner didn't have an equipment contract either.
Sorry RMM - just read your question again and realised i answered something totally different. Has to be in the top 3 as majors don't come along often enough for one model to win many. The JPX900 Tour has been a bit of a surprise package to some.......there was some doubt whether better players would play JPX over MP.