buff rock vs buff orpington-what's the diff?

[Runalong]

thinking about next year's hatchery order- what is the difference in terms of temperament, size, eggs, etc between these two breeds? I want to pick one to order but I don't know how to differentiate them. thanks much!

 

[RAREROO]

Physically differences are that the Rocks SHOULD have yellow leggs and be less fluffy that the orps.