According to Ponyboy, what is different about Dally from the rest of the guys?

From the text:

Dally had spent three years on the wild side of New York and had been arrested at the age often. He was tougher than the rest of us--- tougher, colder, meaner. The shade of difference that separates a greaser from a hood wasn't present in Dally. He was as wild as the boys in the downtown outfits, like Tim Shepard's gang.

I think 188hj