Which came first, the chicken or the egg, eh?
A literal answer is somewhat obvious, as egg-laying species pre-date the existence of chickens. However, the metaphorical view sets a metaphysical ground to the dilemma. To better understand its metaphorical meaning, the question could be reformulated as: Which came first, X that can't come without Y, or Y that can't come without X?
So, in metaphorical terms, neither can come first, so your question cannot be answered.