The most obvious difference between Benvolio and Tybalt is their temperaments. Benvolio is calm and rational, whereas Tybalt is prone to flights of fury. In Act I, Tybalt wants to continue the fight begun by the servants of the Capulet and Montague households, and Benvolio is trying his best to keep the peace. Because of this rational behavior, people, even the Prince, tend to trust Benvolio’s word. He is the one who explains what happened in both the fight at the beginning of the play and in the deadly duel concerning Mercutio, Tybalt, and Romeo.
You can contrast the two with:
Peace Maker vs Aggressor
People see Tybalt as the Aggressor and Benvolio as the Peace Maker, like the two poles of the Planet. Benvolio values Peace and likes to stop fights. This is shown in Act 1 Scene 1 in the Market Scene, where he said "I do but keep the peace: put up thy sword, Or manage it to part these men with me." It is said during the Market Brawl/Fight scene where Benvolio tried to part the two houses and stop the fight. This clearly shows that Benvolio is the peace maker. In contrast, Tybalt is shown as the Aggressor. This is shown in Act 1 Scene 1 68-70 "..., and talk of peace! I hate the word As I hate hell, all Montagues, and thee." This was said after Benvolio invited peace amongst the families and Benvolio rejecting that idea. Those two examples shows us that one person values peace and the other values war and hatred, in other word the "Aggressor". With Aggression and Peace comes respect from their community.
Trust and respect from society
Although being in the upper class of the society, Benvolio and Tybalt have different respect and trust from the society. Tybalt, with his brutality and love for fights tend to be less trusted by the community. An example would be in Act 1 Scene 5 86-87 "Be quiet...For shame...I'll make you quiet" That is said by Lord Capulet when he told Tybalt not to fight Romeo, this is an excellent example that shows us that Lord Capulet does not trust Tybalt and has to blackmail and order him to stop what he is wanting to do. In contrast, Benvolio is very trusted and respected by the community. This can be shown in Act 2 Scene 5 150 "Benvolio, who began this bloody fray?" This was said after the Romeo and Tybalt fight, where Romeo slayed Tybalt and the Prince arrives at the scene. Out of everybody that was in the scene, the Prince only requested Benvolio to tell the truth, that is an excellent example that shows us that the community has repect and trust Benvolio. Although, trust and respect is important, a thing far more important is family loyalty.
Many people see that Tybalt asa bad man and Benvolio, is a kind and trust-able man, but the fact is, that they are quite similar in terms of Family Loyalty. Family is actually quite important to Tybalt. It is shown in Act 1 Scene 5 75-76 "It fits, when such a villain is a guest. I'll not endure him!" This is said when Tybalt saw Romeo at the Capulet Party and him wanting to take revenge after the Market Brawl. Although this might sound like aggression, it has quite a lot of Family Loyalty behind it, because he knew that if the Capulets and the Montagues fight again, the Prince will punish the Victims by death. He didn't care because Romeo trespassed in the Capulet area and he was about to do anything he can to kill Romeo. Benvolio is quite similar in the fact that he cares quite a lot about his Family Members especially Romeo. This clearly shown in Act 1 Scene 1 158-160 "...sad hours seem long" and "...What sadness lengthen Romeo's hours?" This is said when Lord and Lady Montague was worried about Romeo and told Benvolio to help search for Romeo. As you can see, Benvolio sensed the sadness of Romeo and tried to understand and help Romeo solve his problem. The examples given, clearly shows that Tybalt and Benvolio are quite similar in terms of Family Loyalty.