Why does Esperanza think that the new girls are better
friends to have compared to Cathy?

Esperanza thinks that the new girls are better than Cathy because they have more things in common than Cathy, and they do not make fun of her name.

Explanation:

Cathy becomes Esperanza’s first friend in her new neighborhood. Cathy claims to be related to the queen of France and hopes to go to France someday to inherit the family house. She tells Esperanza about the other people on Mango Street and disparages nearly all of them. She agrees to be Esperanza’s friend only for a week, until next Tuesday, when her family will move. She offends Esperanza by telling her that her family is moving because the neighborhood is getting bad, when clearly what makes it worse is that families like Esperanza’s are moving in.

Esperanza sacrifices her friendship with Cathy by pitching in for a bike that she will share with her two new friends, Lucy and Rachel. Cathy does not want Esperanza to have anything to do with Lucy and Rachel, explaining that they “smell like a broom.” Lucy and Rachel are Chicana sisters whose family is from Texas, and they are more similar to Esperanza than Cathy is. Esperanza is embarrassed to tell her new friends her name, but they don’t laugh at it or find it unusual. Esperanza knows she eventually must share her friends and bike with her sister Nenny, since she took money from Nenny to help pay for the bike, but for now, she decides to wait and keep her new friends to herself. The three girls ride their new bikes together around the block, and Esperanza describes the geography of the neighborhood.