I think that the best is investing Bitcoin and gold too. This is less risky and the perspective of both is a high price.
Maybe the bitcoin is better than the gold. You can spend the bitcoin to buy things, but not the gold.
That is not actually something to be considered as bitcoin is also not accepted every where right now so we also cannot use bitcoins to buy things but we also have to sell it for fiat in order to spend it and that is what we do with gold as well, but the considerable difference between them is that gold is more secure than bitcoin as the price of gold does not drop as much as much bitcoin's might does.