I know I feel darker yokes taste better BUUUUUTTTTTTTTT. I have done blind taste tests with my eggs and store bought. cooked the same in two skillets and I could not see the egg. I COULD NOT TELL A DIFFERENCE ... TRY IT !!! Since you have a 50% chance of guessing use this following rule. The person serving you will serve you 4 plates, might be different egg on each plate or same egg on each plate. This way you lose the 50 50 guessing option.... make sure both eggs are the same temp going into the skillet..
I never really tasted a difference in eggs, but I know what they eat & how they are treated & I am happy with that. I know the texture of my eggs are different, because you can see it!