If I were to choose between the two, ill choose bitcoin for some reasons. First of all bitcoin was cheaper. Gold I think is already in the pinacle of it's price and wont rise more while on the other hand bitcoin is new and have potential to grow more in the future. There's also a possibility that hold will be overtaken by bitcoin in the future that's why I choose bitcoin.
Yes bitcoin has higher potential to grow in future in compare to gold as gold is more stable and cannot reach to the moon anytime and profits from bitcoin will surely exceed then gold in long run.
Bitcoin's future as an investment tool looks way brighter than that of gold. A quick look at a 5-year price chart would be all the evidence you need. Still gold won't be abandoned as an investment asset or as a simple storage of wealth any time soon. As long as central banks keep it in their reserves, it will remain expensive and will probably maintain moderate growth perspective.