I assume you are refering to Chapter Two of this great coming-of-age classic. This is of course when Two-Bit lectures Cherry and her friend on the differences between Socs and Greasers and the joy of fighting. Note what he says distinguishes the two groups:
Skin fighting isn't rough. It blows off steam better than anything. There's nothing wrong with throwing a few punches. Socs are rough. They gang up one on two, or they rumble each other with their social clubs. Us greasers usually stick together, but when we do fight among ourselves, it's a fair fight between two.
Therefore, in Two-Bit's opinion, the main difference between the Greasers and the Socs is that the Greasers are more honest and don't use unfair tactics to win their battles, such as ganging up on one person. Also, they are much "rougher" than the Greasers in the way that they fight, whereas the Greasers are fairer than the Socs. Both groups are of course violent and have fights, both between the groups and within them, but in Two-Bit's opinion it is the Socs who are the worst.
As was mentioned in the previous post, Two-Bit believes that what separates the Socs from the Greasers is how they fight and interact with their own gang members. Two-Bit mentions that Socs tend to gang up on one or two people, and also fight among themselves. In contrast, the Greasers usually stick together, and when two members do get into an argument, the other members allow them to settle it individually. Two-Bit then gives Cherry and Marcia an example of how Greasers would handle an incident between Dally and Tim Shepard's gang. Two-Bit insists that regardless of the outcome of the fight between Dally and Tim Shepard, they would not harbor negative feelings towards Shepard's crew. Two-Bit essentially believes that the Greasers are more genuine, loyal, respectful people than the Socs. The Greasers do not believe in holding grudges or ganging up on others, but choose to offer continuous support for one another instead.
the greasers are better people and have strong bonds with each other
Two-bit said that the Greasers have friendship while the Socs have money and brats.