If you want to compare maybe I don't think we need to compare because it's better of course to choose to have both than just one between Bitcoin and Gold, right? It seems to me that Gold and Bitcoin both have a hedge against economic issues like inflation.
But if we talk about Bitcoin better than Gold, I think it's because we know that Bitcoin is easier and more flexible because it's easy to move, easy to store, hard to counterfeit, transaction fees tend to be low and we don't need a third party or government intervention for our ownership status.
Even though the volatility of Gold tends to be stable than Bitcoin and Gold has an unquestionable reputation because it has been proven and tested for several centuries but in my opinion Bitcoin offers more ease of access than Gold.