Gold doesn't have any surprise potential - everyone know about it, its properties, estimate supply, etc. Bitcoin is even better for storing value, because it's easy to move, obtain and store, unlike gold. Although being digital makes it reliable on electricity and Internet, which can make it bad in case of big war or other disaster. Bitcoin is obviously riskier than gold, but also comes with a very good portential to double in price in a few years, something that gold can't realistically achieve.