I'm trying to think this through evenly...I mean, AHITW was so emotional. The final scene in Fred's room was probably one of my favorites of the series. The acting was top-freakin'-notch. There's Lorne's awesome scene with Eve, Angel and Spike's teamwork in the Deeper Well, the interaction between Gunn and Knox...everything was just so amazing.
And there's Not Fade Away. Again, the acting was perfect in this. Everyone worked their asses off, and it showed. The ending was BEAUTIFUL, the fights (what was seen) were excellent, and the dialogue was great.
So, this all comes down to a coin toss.
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Tails = Not Fade Away