The further you are from the ‘ramp’ the harder it is to jump. If you’re close, you really only need to fade and jump at almost the same time.
If you’re further, and try to hit the jump at the tail end of Fade you need to have incredible timing.
However, in my experience, I find that when I do manage to time the jump at the end of fade I can get more distance (not height) on the jump. If I’m closer to the ‘ramp’ I tend to get more height.
I’m not sure if this is the same for everyone.
The thing is it depends on what jump you’re trying.