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.
Both of them are a good investment in my opinion. I'm still a gold person I invested on them since the dotcom bubble crash and it gives me goods returns. Not that gold bullion, but in jewelries. And yes sometimes If I needed money, I just go to the nearest pawnshop and then instant money.
But when bitcoin or crypto came into the picture. I put a decent amount as well and we all know how much we all earn specially last year with a 700% or more growth. So if you have the chance then invest on both of them.