Isn't the Ep2 end theme just a remix of the old tune from St. Olger's in Lost Coast? It's the same thing they played on the first Ep2 trailer as well, except they mixed in a bit of darker stuff at the start, I think.
Anyway, there were better tunes in Ep2 than the end theme, why are those the only two nominated?
Both great, but Still Alive takes the biscuit. If we were talking about the Portal vs Ep2 soundtrack as a whole, then I'd have a harder time choosing because Ep2 by definition has so much more music content and variety. I might still be inclined to go for Portal though... the 'Self Esteem Fund' ambient track is superb.