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.
I think we can not say that choose bitcoin and gold is such as betting because both are really give benefits to the holder. Bitcoins future is nice so I choose bitcoin for now but I can not change all of my wealth into bitcoin because I still need paper money to fulfill my daily need.
Anything there is a risk, even if we do not specify the option then there is a risk of loss of time, I think, currently bitcoin is better than gold because it has been proven to be beneficial to hundreds of percent in a short time.