This is so hard when restricting the options to the first four. Two, to me, had the greatest villain with Drusilla, but also the worst villain, with "Angelus". It's just absolutely criminal that she had to share the spotlight with him. Angel is passable when good, but when he's evil, I just cringe from his attempt at acting. To make things worse, Landau is so talented, and so idiosyncratic in her scenes, that Boreanz's performance just comes across as forced and muddled. It's almost weird to me to see such talent and non-talent share a scene, because it gives this surreal effect, not to mention can make one feel ambivalent about the ep's in general.
Three was great, and Angel got a little bit better. Unfortunately, not a whole lot of conceptual effort was put into Faith's street persona, and it came across as almost embarrassing, no fault to Ms. Dushku. Great plot, though, and it's fun to watch Willow's witchiness really emerge. It's hard to choose between two and three. I really, really don't know. Too bad we couldn't have opened up the poll to 5, because then the competition would have been swept away...
Maybe I'll go with three. Yeah three. I'm sure if someone asked me again in an hour I'd change my mind. It's just too hard.