Tybalt and Benvolio are similar because they are both really loyal to their families, Tybalt is loyal to the Capulets and Benvolio to the Montagues. They are also middle ranking figures in their families, that are looked up to and listened to by younger servants.
However, they are also very different. Benvolio is brave but also tries to avoid fights, and makes attempts to calm down tense situations. Tybalt on the other hand is angry and violent, even drawing Benvolio into a fight by saying:
What, drawn, and talk of peace! I hate the word,
As I hate hell, all Montagues, and thee.
Have at thee, coward!
