I am also in support of gold which is more valuable than crypto currency in my own opinion , theres nothing you can use to qualify gold because it is natural and crypto currency is man made.
To me gold is more valuable.the supply is not known as you said and it is one of the natural commodities the world is blessed with not like cryptocurrency which is created by man.both of them are volatile which means they can make you a lot of money in a very short time but I still prefer gold