I think a 1 single Gold is still much more valuable than 1 single Bitcoin but maybe in terms of the growth through the years the real winner is Bitcoin and no doubt about that because Bitcoin is not yet 10 years in existence.
As Gold is tangible while Bitcoin is not it is in different league but with a certain amount of value you can differentiate them but please never compare them and tell that Bitcoin defeated gold.
Gold has been on the earth since dark ages and the use has gone wild by now that why it is having that much value. But just look at the bitcoin, it not even full grown child and it has got the value competing to gold. This could not be achieved with any other asset and ven if you try to create one another it will fail to do so.
Yeah I know there is no comparison should be done with these two assets which are completely different in nature. One is gold, a precious metal and another is bitcoin which is virtual and bunch of codes over the blockchain. But still we can see the power of advancement and choice of people to invest money. That's for sure digital one and with the advancement it will increase more.