Can't really tell what something is worth by the material, Because some baseball cards and comics books are worth much more than there wait in paper. Some comicsbooks could strip a entire forest in there weight in imaginative worth.
However in real worth, on a desert isle, I would take the juliet over the gascan, because I could make hooks and sharp objects with them to survive. A 20,000 dollar comicbook? What?, maybe start a fire and some reading material when your evacuating yourself? But how long would that last until you got bored with it and lit another fire?
The DF2 gascan would just be about vanity. Unless the tribe of the area finds you to be quite spirtual looking in them to call you leader. But man you would have to look pretty damn attractive in them to pull it off. I for one would be on that nights dinner menu. So again I am left with the juliet as my choice of survival.
Nah when it comes to paper rocks and sissors the juliet is hands down my choice. Gawd lets hope it never comes down to that. I like them both.