From a darwinian perspective which came first the chicken or the egg?

From a " Darwinian " " perspective " ( perspective is a term not used in science, but usually social science/humanities ) the question makes no sense. Populations evolve, individuals are selected. If you can not get this simple concept evolution and evolutionary theory will make no sense to you and you will continue to ask ill posed questions.

Your question is directly analogous to asking something like....

" How much does the color blue weigh? "