Cell should win this battle. He is much faster than Green Scar and possesses the advantages of flight and energy manipulation. I believe Cell is smart enough to use these advantages to avoid a close confrontation and remain airborne while he bombards Green Scar with energy blasts.
Like sceonn said, Super Perfect Cell was capable of regenerating after undergoing self-detonation. This won't end well for Hulk. Unless he can completely destroy all traces of Cell's body, Hulk is doomed.