It came down to the first two for me. Both for somewhat different reasons I may add though.
The first, I know to be completely self made with vectoring and whatnot, which immediately gives it a huge one-up. That said, I can't see the relevance with the theme, unless it's a direct quote or reference I'm not catching. Anyways, besides the effort and the effects really shining, the tag hasn't got the strongest composition (focal feels a little squished to the right of the canvas). But honestly, is still an amazing tag and way up there.
The second tag gains so many kudos for originality, freshness and finesse. I'm not sure if the stocks were pulled directly from the videos, or traced/recreated with a reference only, but either way, seriously cool stuff. While there is a chance that it was pulled directly from the video, the relevance to theme, aesthetic appeal and general overall standard of the final product is really quite impressive.
It is pretty tough to choose, both have different styles, and very different reasons for choosing them over the other, I'm voting for the second tag. Seriously good stuff.
Good luck to everyone! :D