I think in terms of the number of users/owners of Gold and bitcoin, that of bitcoin should be more. I take my analysis from the levels of people who use both.
For Gold, it is usually the wealthy's pride. Gold is mostly used by the rich who see it as a store of value and class. But, bitcoin is not a class commodity, every strata of human community, society and persons can have access to it.
The popularity of bitcoin is more because it also plays a dual role of store house for affluence and also for payment purposes.
However as a comparison everyones know the value of gold, so as they made a gold as a benchmark of one's wealth. Sure enough, they will find various ways to try and get a gold as a place of investment or jewelry that he uses to show someone that he has a wealth. The popularity of gold has been comprehensive, there is no one that didn't know about gold.
Bitcoin, the new technologi which can juxtaposed with gold, and even the user of bitcoin will as a digital gold. Someone can buy bitcoin with anything money they have, although they have $10. But I don't think everyone who know about bitcoin firstly they will self-acting to buy bitcoin. I just need convey to you, the user gold is more than with the user of gold now.