You should be wary of the Gold / Silver story that LTC supporters push.  Nothing against LTC, and that storyline may easily take hold of the public's imagination and lead to a pattern of trading between the two in a fixed ratio related to their scarcity -- but gold and silver are two elements, and it's been quite a while since anyone created a new element.  The tradition of looking at the ratios of value between those two could easily break down in a world where millions of people can create a new element, with different properties, on a whim.