Both
For me i prefer to choose both of them as my investment because gold is safe investment and bitcoin because the price is rapidly increasing .
Gold is a good asset or as a investment, but I think you will be bored when you are always looking at the price especially when you are a used investor or buyer of digital currencies particularly bitcoin. Gold slowly increases price while bitcoin, well it don't usually go up but apparently, it always change every single second the reason bitcoin is risky but worth it.
It would be a great choice if you will just grab both because gold and bitcoin are great options for long term investment because they are like long lost brothers because they have the same movement for the price which is to go up and it is really a great thing to own some bitcoins because we can easily earn money.