A weird question to ask if you mean 'a' as 'one', since from what google tells me, one metric ton of gold is worth $46.7 million, whereas 1 Bitcoin is worth $23.7k.
Yes, I know one Bitcoin is much cheaper than one ton of gold, but there was a time when one Bitcoin was cheaper than one gram of gold. I do not mean “would you take one Bitcoin over one ton of gold today”, because the obvious answer is the ton of gold. However, I believe one Bitcoin is inherently more valuable than one ton of gold; regardless of what the market currently says.