True, but considering that Hulk is immovable, he wouldn't be able to do anything physical, he reverts his internal part back to banner (or somehow reverts back). Sonic then kills him.
If not, I would consider it a stalemate since none can kill the other.
Hulk stomps all day....He thunder claps putting the little hedgehog on his ass while he approaches than pounces for the kill,,,,the only use of all that speed is to run away,,which won't get him a win so if he tries to actually battle hulk he will lose
A thunder clap would be too slow for the speed of light.
Hulk has an override - when he turns back into Banner, he's still immortal, because if his life is in danger, he immediately Hulks out. Sonic can die, though. Also, as far as I know, Sonic has a limited amount of energy, unlike the Hulk.
@Vouile: Hulk can deal with any physical force and phasing as well. His regenerative powers are too fast. Even if he died, he'd come back from the dead.
I mean, this is the Hulk. Incalculable strength; capable of moving at Mach I, possibly faster; the fastest healing factor that isn't divine in the Marvel Universe; Immortality; Durability which keeps his BONES from breaking under the crushing strike of Mjolnir; Super-human senses; etc.