"The Gift." Not only because I like Buffy more as a person and relate to her more at that point (not that I don't love bitty!Buffy, because I do, but grown-up!Buffy is my GIRLFRIEND), but because I'm more invested in her relationship with Dawn than I am her relationship with Angel, and I find her GIVING HER OWN LIFE more moving than killing her boyfriend, and also I like all the moral ambiguity surrounding the episode. Also: Spike. And Anya. And Dawn. Excellence all around.