Bjorn may be the most successful in racing but - you cant buy style.
Both KP and AA run circles around him when you look at overall sailing talent - ie ability to wave sail (with style) AND race really well.
Bjorn is a racing (and was a jumping) machine
His wave sailing was always really ugly to watch - apart from some pretty cool wave 360s occasionally.
In my opinion this makes him less than the greatest windsurfer ever...
At this point in time someone like taty who can race, throw double forwards and has an INCREDIBLE freestyle repertoire has way more all round abilities than Bjorn. Taty is a far more complete athlete...