hope you asked the same question on the kite surf forum

comes down to cost, like the donk said, space for storage, and transport
windsurf stuff takes space
i believe that dollar for dollar the sports are similiar
i have been told that kitesurfing is a little "easier"
in real estate they say location, location, location
where you plan to go - wind, waves, setup area , etc all count
lessons for kiting are more available than windsurfing - where i come from as well
if you can try windsurfing - the first try is easier in this sport - in lite winds

as long as either one gets you on the water with a smile = life is good
on this forum we will be biased towards kitesurfing of course
joewindsurfer.blogspot.com/p/how-you-can-start-windsurfing.html