Gents, thanks a lot for sharing your opinions.
Let me say that my remark was mainly addressed to the human factor. Under the hypotheses to keep constant all the a/c characteristics but the human interface of controls, I noticed that my pilots tend to easily decouple for/aft movements from left/right when they use the yoke, while during the first minutes of flight with the stick they tend to combine some of these movements.
After a short practise they all tend to achieve the same decoupled results, but depending on the habits and training the adaptation can vary significantly.
When I was in the air force one of the typical mistakes made by student pilots, when trying to enter a spin with a stick controlled a/c, was to pull the control not completely straight to their belly, but also adding some right or left inputs, depending on which hand they were using.