Hi Wingrider,

It is a combination of both.  I would say it is about 30% Pumping the wing and the rest is pumping the board/foil. 

This also depends a bit on how much wind you have. In light wind you really need to pump the foil to the get the foil to engage as the wing wont be creating much pull.  In strong winds you can pretty much use the wing to get flying without pumping the board much.

Another factor is the wing itself.  Some brands have really flexible wings, and a few have stiff wings.  The stiff wings generate a lot of power when pumped which make them easy to pump to get flying, others ( a lot actually) as really flexible and produce very little power when pumped as they dump most of the power out as the wingtips flex away from the strut.  These are basically useless in really light winds and you need to really work the board hard to get flying.

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Gunnar