White leghorns are considered the premier comercial egg producing chicken in the USA--At least it had been post WWII until the 1980's. It lays a nice white shelled eggs. Most of the white eggs in the supermarkets in my area are from white Leghorns. Commercially eggs are produced in caged birds w/o roosters.
Buff Orpingtons are a good duel (egg/meat) purpose bird a bit larger than the Leghorn. The Orpingtons lay larger sized brown eggs. The only chickens rated larger in size than the Buff Orpington (thought are several rated the same size) is the Jersy Giant.
Eggs from chickens raised on the ground verses in cages have a much more richer taste. Fertilzed eggs taste even better--Let's hear it for the Rooster.
My barnyard flock are a cross of Aruacana, Buff Orpington, Leghorns, and Light Brahma. I get brown, pink, green, and tan colored eggs but no white 1s. I'm trying to develop a chicken that is self-brooding, hardy, and versitile.