Questions (manu many questions!)

- Is it correct to say that for beginner and intermediate people wing foiling is not (and no more than wind foiling) dangerous regarding potential body injury ?

With a wind foil there is definitely way less chance to hurt yourself with the foil or board. If you hang on to the boom when falling in there is almost no way to touch the foil. If you have shore break or breaking waves in shallow water then it might be more cumbersome to get to the deep enough water (or come back) with the wind foil equipment, and easier (less chance to hurt yourself) with the wing foil.

- Still for same level people i was referring above, is wing foiling more or less "scary" / "impressive" than wind foiling?

Not scary, but take the time and learn to control the foil. The fact that the wing foil board is not connected to the rig introduces a whole lot new ways to make stupid mistakes. Don't rush and don't get too comfortable and overconfident too soon, enjoy the learning steps.

- When people is no longer used to "wave sailing efforts" (little harness use and stuff), is the wing foiling particularly hard for fit people?

Physically not demanding, if you are already wind foiling it's easy to learn.

- As long the rider level grows, is it easier to blast with a wing or with a wind foil stuff?

Define blasting. If you mean riding in a straight line having lots of power in the sail then that would be easier when wind foiling.

- Is it possible to use a wind foil (adapting the tuttle to the double rail box of a 110/120 L wing board) with 90 cm fuselage for wing foiling? ..even tough I think a freeride 1000 cmq front wing is already a medium level rider oriented tool. But the worst thing is that there's no bigger same brand front wings available...

The only thing that makes the wind and wing foils different is the length of the fuselage. It's possible to wing foil with a wind foiling fuselage as well, but it's not ideal. A shorter fuselage works better for winging. Don't expect that merely because a board and a foil can be connected together they would work well together for wing foiling. A 1000 cm2 front wing is way too small for beginner wing foilers.

- Coming from (too) many years of windsurfing i'm used to relate the stuff i use to the day condition. I guess this is the same for wing foiling but i couldn't find any note about that for wing foiling. I assume that this activity is less demanding in terms of accurate gear vs condition compared to windsurfing as you may empower or depower the wing but still this may be important to have a better idea about the "starting kit" for my places

As with windsurfing you will need several wings for different wind strengths.

- as we're approaching strong winds seasons, is it a problem for a correct learning curve (despite i tend to think this maybe easier than wind foiling in same condition) ?

Wind foiling in stronger winds is not difficult at all, you just need to have small enough sails. Same applies to the wing foiling - it's easier to learn with oversized gear, and after you have the technique for getting going with a sensibly sized wing (that matches the wind strength) it becomes easy in stronger winds as well.