I think that trading spot precious metals then go for gold. Gold charts are more reliable than silver charts and moves are a little more predictable. Silver is not traded as much as gold by $, so can be moved quicker and be more volatile.
If holding physical then go for silver. Not that I think we would see gold confiscation again, silver may be more of a trade-able commodity when (and if) things get worse and we see hyper-inflation.
Gold to Silver Ratio does not seem as valid as it used to be and not as inter-related.
Will we ever see a gold-backed currency again? If so, then the central banks would want to keep a lid on the price of gold, which is happening anyway through naked futures contracts.