Difference between the vortex and the wind force In a recent answer, stacker stated that the vortex is better then the wind force for cloth simulations.
What is the difference between the vortex and the wind? How does each relate to cloth simulations?
This was for the use case when the cloth is pinned. Animating a flag (with a loose end) a wind force works well. 

By using a wind force the sail in the scene stopped fluttering after a few frames like blown up. Which is probably more realistic if you have steady wind from one direction.

Since I wanted it wobble I tested a vortex which  behaves more dynamically, more like a fan where the airflow changes it's strength and also allows the canvas to retract.