I'll go back to my statement about the only true sound form of money being the theoretical currency used in the transformers cartoon "energon", blocks of energy that can be redeemed at full face value at any given time regardless of externalities.  Lacking such technology, since matter and energy are interchangable, the next most likely candidate is the most easily convertable form of matter, and thus we end up with oil backed currency.

So no, from a rational point of view, gold doesn't actually make the most sense unless it can be easily converted, or you're living in a pre-industrial revolution civilization.  But the problem is, the oil, or most energy sources in general can be cheated with fractional reserve or inflation, so here we are with Bitcoin because gold has lack of granularity, high friction in use, and the same counterparty risk as the oil dollar when it has to go in vaults and be used with IOUs.