Gold is just not useful as a currency at all. Bitcoin is far better, but if you want to hold something physical buy gold instead.
Gold is not a thing that you need to pay what you buy. So, why using gold as a currency? If you want to, sell your gold into fiat, and buy the stuff with that. Gold is the best way to do investment, because the price is more stable than bitcoin. We can't predict how the bitcoin price is in future exactly, but the gold investment that have been done for all this time prove us that gold is the best.
Volatility must be compared at a risk adjusted basis. After adjust the risk to same 5% per year level using lower leverage, the bitcoin outperforms every single investment in the world