Marcus Brutus makes his speech very formally to reason the mob for killingCaesar.
He tells them that Caesar too ambitious and would eventually become a muchpowerful ruler and would make the Romans his slave.
Brutus appeals to the people's minds and leaves an impression that Caesarwould have become a tyrant.
What Brutus terms as his reason is a hypothetical situation and is not reasonenough for killing Caesar.
He does not provide any evidence to his statement that Caesar wasambitious.
Where as Mark Antony uses flawless logic and genuine emotional appeal inhis masterful oratory.
First of all, Antony enters dramatically to the pulpit with Caesar's body to winthe sympathy of the mob.
He began his speech by addressing the mob as "Friends".
Antony really wants to avenge Caesar and tries to convince the crowd into believing the truth that they killed Caesar out of envy.
He is successful making the mob rise against the conspirators in 'mutiny' and'rage'.
Antony provides evidences of Caesar's humanity and attachment to people byshowing them that Caesar had made the people his inheritors of his wealth,gardens.
Also Antony tells the crowd that Caesar had always sympathized with them.
This has a greater effect on the people and Antony's periodical emotionaloutburst only contributes to Antony's impulsive and improvisatory natureserves him perfectly.
Antony is gifted with the power of oratory that helped him to stir the commonman.
