both have own benifit, i am going to discuss merits and demerits
Bitcoin has merits over gold for example - It can save as digital asset or we can say in electronic form.
Bitcoin trading can be more profitable than gold trading.
but gold has merits over bitcoins, Gold has more security in terms of investment because govt. has legalized gold trading.
In my opinion, this is wrong because bitcoin marketcap compared to gold is still very far, besides we can say that bitcoin is better than gold if bitcoin is acceptable to anyone around the world, but based on current information bitcoin users are currently no more than 1% .