... I say Theophany.
Epiphany is celebrated by both the Eastern and Western Churches, but a major difference between them is over precisely which historical events the feast commemorates. For Western Christians the feast primarily commemorates the coming of the Magi, while in the East the feast celebrates the Baptism of Christ in the Jordan (Theophany). However, in both cases the essence of the feast is the same: the manifestation of Christ to the world (whether as an infant or in the Jordan), and the Mystery of the Incarnation.
Rather simplistic description on my part, I know.
for the real theological meat and potatoes read Fr. Stephan.