obviously gold would be the safe bet and bitcoin the risky. With gold having had thousands of years of maintained value and bitcoin being a few years old and extremely volatile.
It is true that bitcoin is a little risky but only on the long term , see bitcoin has a rising values that eventually has and end but gold does not so as long as bitcoin exists you can chose the bitcoin over the gold , but like any other way to earn money there are always risks , the greater the risk the greater the prize.