I vote for BOTH! (the chicken and the egg)

As much as I like the cleverness of determining that it was the egg that came before the chicken, and it does make sense in the context of biologically classifying critters, It's merely a matter of names and categories. The creature that layed the egg which would become the 'first chicken' was a creature very much like a chicken. It would be very difficult to determine exactly when the evolving creature finally fit the specifications of a chicken. It's not like a dog layed an egg which hatched a chicken... It seems quite likely to me that the egg evolved as a way for creatures to safely give birth to there young, so there were probably creatures before there were eggs!