*He is able to run at even the speed of light.
*He has super fast healing.
*He can process information at a fast rate.
*Full control over his molecular structure, being able to make himself intangible or invulnerable, he can also go through solid objects.
*He has the potential danger of getting trapped by the speedforze.
*He has to eat vasts amounts of food to maintain his energy.
*Super speed (supersonic)
*Teleporting (going to the future and back at a difrent location).
*Creating Wind cyclones
*Can breathe without much oxigen
* he is quite inpatient
*He looses his powers whenever his sister alters reality.
I think flash would win not only because his "superior" speed, but due to the fact that he has a conection to the speedforze and could potentially trap quicksilver in it like it has been seen before.