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Well, Plymouth Rocks and Orpingtons spring more or less for the same time period in the 1800's during which it was all the rage to develop new breeds (Rocks, Orpingtons, Wyandottes, etc...) and new varieties (barred, white, buff, partridge, etc....) They are, however, different. The former are distinctly American, while the latter are certainly English. Both show the general trends of their homelands during that time period. Both, being Buff, betray a trend during that time period to be enamored with Asiatics, which had been newly imported to the Western world. Indeed, they were such a surprise at the time that it began what is called the "Cochin Craze". Prior to their importation, there were no buff birds in the West. This sort of information is generally absent from modern poultry books. To learn more, go to "Google Books" which is an on-line compendium of books that are out of print. Search for poultry and the breeds that interest you, and various titles will pop up. They are readable on line for free. Click on one and begin the rather cool discovery of how the various breeds were developed. It's rather interesting.
For production qualities, Plymouth Rocks tend to be better layers. However, I am of the opinion that an Orpington is a better eating bird. Both lay brown eggs (another effect of Asiatic importation, for all traditional breeds of European poultry lay white eggs, and brown eggs were developed via outcrossing to new Asiatic imports which all lay brown eggs.) Both are good broodies and attentive mothers.
However, as one begins to get to know chickens more deeply, one realizes all of the different subtleties. Plymouth Rocks and Orpingtons are very different in shape, often referred to as type or conformation. They have a different feather quailty. Plymouth Rocks, though not very tightly feathered are much more so that Orpingtons which are quite loose feathersed, which gives them a more massive appearence.
Do some homework and then choose one of them. Both breeds have breed clubs, which are networks that unite breeders of the one breed and help them maintain communication. Both can be visited on-line.
I hope this tempts you to adopt on of these lovelies. When well bred, they are amazing both. As a child my father maintained Buff Rocks, and they were outstanding.
Best to you!