Both are good but not all people fits with investing gold so as bitcoin, we have to consider what we can afford to invest. The problem is, we like to invest with gold as it is more stable but have we realize how much we need to start investing?
The idea is to save your earnings overnight securely not to make you any richer or poorer for that matter. The price changes in gold is just an effect of the dollar itself varying in its worth, mostly gold is very limited in supply and regular in demand which means its price is mostly the same not just now or this year but a similar price for this decade the last century or even a thousand years. Gold valuable for been continuously reliable for generations of people, longer then quite a few countries have existed.
Bitcoin should have higher growth, you might have the idea it can make you rich and I guess it will do that or lose it all as some holding with exchanges experienced. I still think you have to do something with bitcoin, not just hold it and if you do nothing then surely gold and its inert nature is more suited