It's up to you, but if you choose to buy gold.. you might end up selling it again or find yourself at the nearest pawnshop, or if you love collecting gold then it can juts put it in a much secure area of your house. ahaha
But when you choose bitcoin, then... there is a great possibility that you'll get much more than you have invested. It's just a matter of patient, hard-wok, and strategies.
Gold has been there for thousands of years and it has proven itself again and again to be a great way to preserve your capital through turmoils and historic changes. I put great emfasis on "preserve" here, because what gold does, it preserves your capital, not increases its value. It may look like an increase when the currency fails, but in fact it is just holding its value.
Bitcoin on the other side has not yet gained its true value. At some point in the future it may become a very stable insurance against turmoils (as gold is), but until it does, it needs to gain a lot so its price reflects its true value. Of course there is risk involved, on what is the 'true value of bitcoin'.
So depending on what one aims at: at preservation of one's capital, or a chance of high (but risky) gains, one should choose gold or bitcoin. Or both, understanding inherent features of each of those investment vehicles.