Gold is rare in several senses: In addition to being a rare element, it is the most ductile metal, the most malleable metal, and one of the best conductors of heat and electricity. It is very stable and doesn't oxidize. It is easy to alloy and easy to refine back to pure state. It is one of three metals that naturally occurs in its elemental state. It is the easiest metal to work for jewelry and other purposes. It is also very dense.
All of these properties are what made gold valuable sociologically. Silver is nearly as easy to work and refine, but it is far more abundant and it also tarnishes easily, so it is two orders of magnitude less valuable.
Platinum is also far more abundant, but much harder to refine, which is the sole reason for its high price. It is also much harder to work, requiring much higher temperatures to melt. It is a far harder and tougher metal than gold, which is why it is often used for the crowns in which precious stones are set, and as a plating material for gold.
Bitcoin is just vapor, good for nothing in a practical sense. It doesn't even have attractive designs like paper money. Fiat money is susceptible to going to zero value; gold will never go to zero, even in some total societal collapse scenario.