I think both, but I prefer bitcoin, because bitcoin can give you a huge advantage over gold, stable gold prices so that the increase is only slightly, unlike the bitcoin whose value is fluctuating so that the value can soar. In addition bitcoin can be used as a means of payment, to buy goods in the online world without us having to pay with cash. Then bitcoin will be very valuable in the future because of the rapid technological advances make everything instantaneous and many will use bitcoin to transact