Wind down is the method used for the commercial.
You can do more with the wind down method ie you can't answer all the questions in the gen nav paper if you do the wind up. Unless the exam has changed you had to do 10-12 questions using pretty much all of the functions on the wheel and work out the third side of the vector triangle using the derived data for the other 2.
To be honest after sitting that paper I haven't used the thing since apart from showing PPL students how to work it and using the board to scape the ice off hire car windows.
When you do the CPL you get discouraged from using it (well I did) and just use rules of thumb to work out the drift and leg times.