I have had the W950 but sold it because I mostly wing at sea (waves)
Now I'm using the W945, W940 and W800
Here my (winging) comparison of the 945 and 950
Im 75 kg
W945---------------------------------------------------------------------------W950
loose, easy to switch to different sides----------------------------------carving (when in a curve, its stays in a curve)
no-ventilation----------------------------------------------------------------ventilation (lot) in waves
low take off speed----------------------------------------------------------higher take off speed
take off gradually-----------------------------------------------------------take off yes/no
moderate speed-------------------------------------------------------------higher speed, but not for speed riding
less stable, but stable enough for one used to foil--------------------very stable
good for swell/waves------------------------------------------------------ good for flat water
waves max 7 ft because of speed limit/front pressure---------------easy swell or non steep waves
pumping ok (in waves)-----------------------------------------------------easy to pump, build up speed
good for beginner because of easy take off and low end-------------good for beginner when having enough wind because its very stable and stays in a curve, needs more speed