Who was more dangerous for Rome Hannibal or Spartacus?

Spartacus was more dangerous. Despite the fact that the Roman army was stronger than the army of slaves in military and organizational terms, a series of energetic and unexpected victories of Spartacus could provoke unrest of slaves, gladiators and conquered peoples throughout Rome, which could trigger a civil war in Rome. Hannibal was not the first conqueror of Rome, before that the Roman army was defeated by the same Epirus king Pyrrhus. Rome knew how to deal with external invasions, so the outbreak of slave riots was more dangerous.