Let's compare them in different areas, shall we?
Winter Layers: BO-excellent, BR-excellent
Summer Layers: BO-fair, BR very good
Cold hardy: BO-excellent, BR-excellent
Heat hardy: BO-very good, BR-very good
Broodiness: BO-excellent, BR-good
Foraging: BO-excellent, BR-very good
Predation: BO-their quiet temperament and light coloring are not ideal, BR-excellent plumage color for hiding from predators and an assertive temperament
Temperament: BO-excellent, BR-very good
Country of Origin: BO-England, BR-USA
Skin color: BO-white, BR-yellow (yellow makes for a prettier table bird)
Size/growth: BO-very large, BR very large
Also, BRs can be sexed early on by their coloring.
Please let me know if there are any traits I left out!
Remember, the "readings," for lack of a better word, are from my experiences and research. If anyone thinks one or more are incorrect and need to be changed, please let me know.