who is the toughest of the gang members and why?

Hi, In terms of Ponyboy's gang, I think Darry would be the toughest. Pony often marvels at how strong Darry is. At rumbles most Socs are afraid to tangle with Darry.

Here is a quote from Pony,

"Darry is six-feet-two, and broad-shouldered and muscular. He looks older than twenty -- tough, cool, and smart"