How do pony boy's feelings for sadapop differ from his feelings for darry?

Pony has a difficult time with Darry. Darry is trying to be a father-figure to Pony, and Pony resists. He feels Darry bosses him around and treats him like a child. Soda is happy go lucky. Pony and Soda have a friendly brotherly relationship. So, Pony really doesn't like Darry, While having a good relationship with Sodapop.