The main difference bettween Tim Sheperds gang and the Greasers was that?

Tall elm trees made the park shadowy and dark, and it would have been a good hangout, but we preferred our vacant lot, and the Shepard outfit liked the alleys down by the tracks, so the park was left to lovers and little kids.

Ponyboy also notes that his gang was Greasers..... Shepherd's gang was hoods.