There are always people who like to compare bitcoin with gold. In fact, they are two completely different things. The value of gold comes from its scarcity. It is a rare metal on earth.
People always think that "a small amount is good"，but we can imagine that if one day we can go to other planets to mine gold, and some planet is full of gold, then the value of gold will be greatly reduced.
Bitcoin is a perfect currency structure, and its total amount is limited. Even in the entire universe, it is only 21 million pieces.
Yes, bitcoin is certainly better than gold. Its total amount is limited, but I dont think all "limited" things must be good. In fact, bitcoin is really worthy because of its mining system and trading system. This is a very close relationship. Human history has never been so systematically designed like this trading model. This is its novelty.
For gold, we can't assume that it will be mined at alien planets. Based on the current technology of mankind, even we can't even mine 80% of the gold on the planet, so it is still valuable.