Do what ever you like.

I prefer parkour. I don't even feel they are parallels. I view parkour as getting into shape, have the ability to do something during emergencies, thinking freely and safely, and have fun. I'm always sure of my abilities and foot is solidly planted into the ground.
I view skateboarding as restricted to a piece of equipment, slippery, no overall philosophy, not as friendly people, and risky.
Of course I'm biased; this is a parkour forum.