Answer:
He is coolheaded while Mercutio is hotheaded
Step-by-step explanation:
Benvolio and Mercutio are both friends of Romeo and are loyal to him.
Mercutio is known to be extremely hotheaded, impetuous, and rash. Benvolio on the other hand is one of the most calm, rational characters of the play. He is also also one of the play's peacekeepers.