Artificial. I never have been able to reconcile the birth of the Savior of the world with the act of killing a living thing and dragging it in the house for display.
Obviously I don't enjoy the Rockefeller Center tree lighting program every year either. They interview some family who describe how their grandparents planted that tree, or some such, and it means so much to their family so they decided to let it be cut down and hauled away, and ground up for mulch after the holiday.