The spelling in this thread has been horrible. But that's beside the point.
Anyone who read Trigun and Inuyasha, and anyone who watched the animes and had half a brain would see that Vash wins this without much effort.
Most of Inuyasha's attacks wouldn't even work because Vash isn't a demon; and the attacks that do work wouldn't connect because Vash is far faster than anything Inuyasha can throw at him.
Vash can also shoot to wound; he does it multiple times and can easily just incapacitate Inuyasha with a shot to the leg or torso where it's non-fatal.
And if he absolutely has to, he can use his Angel Arm which is more powerful than anything Inuyasha ever displayed or went up against.
Long story short, Inuyasha loses 10/10, even in Full Demon mode.