What is the difference and which is best used for basic GA aircraft and twins?
Hi, can you be a bit more specific?
In person, I only have 1 throttle which works exellent with all aircraft ( single, twins and alle others)
As long as all of the used engines are healthy and deliver the same power.
From the moment 1 or more engines are going 7700 I start praying for a throttle quadrant.
Happy 
Throttle axis is for binding a dedicated throttle lever. Throttle axis 0 to 100% is for binding a button so far as I can tell. The longer you hold the button down the more percentage it adds to the throttle opening.
The descriptions in the UI are pretty abysmal and confusing I agree.
Its very confusing indeed, Iāve had different things happen on different planes, but from what I can see is that throttle axis 0-100 is for forward throttle motion and doesnāt include reverse axis. Where as Throttle Axis included reverses as well. The issue is some planes configurations actually have a separate config on how reverses are handled in the EFB, for example the A320. So what Iāve done is I have two profiles one with 0-100 in and the normal axis one, so depending on the plane I select the profile that works best for that plane.
Well, thanks may answer the question not sure. I havenāt been able to find any ref to this in the documentation and there are some very odd results using the 0-100% on an axis control rather than a button.
Oh dear, this gets worse, some other stuff on this forum suggest the opposite, ie 0-100% for those planes with reverse. I canāt understand why MS donāt clarify this one.
This apparently the MS AI answer which kind of makes sense to me:
- Throttle Axis:
This refers to the input device (like a joystick) that the simulator uses to control the engineās power output. Itās a physical control that you move to increase or decrease power.
- Throttle Axis 0-100%:
This represents the value or output that the simulator reads from the throttle axis. When the throttle is at 0%, the engine is producing minimal power, and when itās at 100%, the engine is at full power. The simulator then uses this percentage value to adjust the aircraftās engine parameters accordingly.
In essence, the āthrottle axisā is the control, and āthrottle axis 0-100%ā is the measurement of how far that control has been moved, thus indicating the engineās current power output.
For example, if you move the throttle to 50%, the simulator would interpret that as 50% of the engineās maximum power, and adjust the simulated engine accordingly.
If that is true - it certainly sounds plausible - the ā0-100%ā one would have been much better described as Engine Power Axis.
It would be essentially adding a simplified āFADECā system to aircraft where the throttle is normally controlled dierctly.
Ridiculous - but not even slightly surprising - that Asobo have made zero attempt to describe the difference.