For starts bitcoin is not a commodity. It might be a collectible if it was tangible. In reality it's a complete fraud, not legal tender to settle debts or taxes owing. It's a scheme to make bit coin miners rich, that depends wholly on the gullibilty of those who believe it has any value. 

Compare the bit coin miner to a real miner. The mined product is a solution to a pointless math problem that ties up massive computational  power. What more do you need to know? 

The process is destructive. Obscene amounts of energy are wasted while real problems in need of solution could be solved. The apparent success of Bitcoin is nothing more than the dumbing down of humans at the speed of light.

The value of gold results from the labor and capital required to render or fabricate it in the first place. From this embedded intrinsic value, gold is able to offer true exchange value to the seller of goods or services - not a fiat receipt.