Everyone will say scarcity is expensive, the gold is scarcity the same as the bitcoin.
I can't find the reason from the gold valuable.
It can't do anything worth thing...
If you reffering to long term investment i will go for gold and if i go for short term investment then i will go to bitcoin why? Because gold have a longer life than bitcoin because bitcoin has maximum value and maximum count unlike gold if you storing it a long long time it will be more valuable.