Cass vs Dick
Not a fight. Both these two have some ridiculous speed feats under there belts. Who is over all faster?
Cass has some solid bullet time feats/blitzes and blur running's.
Nightwing has some ridiculous dodging bullets from loads of bullets everywhere to the point that it makes no sense, to even escaping Slade as a teen and playing keep away from Slade. Plus on panel statements of being faster then Bruce Wayne himself.
They also once had a race(but they were using there grappling hooks as well) and I think Grayson won?
But over all who would you bet on in a standard foot race?