[latchkey]

They have different fundamental values.

Gold is scarce because it is hard to find, and available in very low concentrations (meaning, you have to process a lot of rock to get to it). There is plenty of it on the planet. It cannot be lost forever, unless we send it off the planet.

"The WGC estimates that there are 54,000 tonnes of “below-ground gold reserves” waiting to be mined. These below-ground reserves account for less than 30 percent of what has already been mined."

Bitcoin will only have 21m total, is easy to find and available in as much quantity as you can afford, which has the value of driving the price upwards. If you lose your private key, it is gone forever, making it even more scarce. Millions have been lost already.