I've had farm eggs (brown)here in NY that have had very deep gold yolks. Yet it seems that the white eggs always have lighter colored yolks.
It always does seem to me, that the brown eggs are always tastier, just seem to have a fuller, richer flavor...
My cousin raises some sort of chickens on her farm...their eggs are a pretty blue-green, kind of like Easter eggs...she says, those eggs are tastier than both the white and brown eggs...