I own both, plus silver.. I think they all will do well, for the same reasons. However, I have a very long term hold/outlook for them as an investment.
I Would go with bitcoin only, There is no matter what might happen in the short term, bitcoin is going to massively rise in the long term.
Bitcoin can offer people a much higher profit than gold if you hold it for several years.
How much growth can you realistically expect from gold in 5 years? 10-50%?
With Bitcoin you get the opportunity to see your money at least more than double from the price right now.
That's why I will also choose for Bitcoin as being the main investment tool for me.
Bitcoin is the best choice to make an investment at a moment, and it is expected that price will skyrocket in future which can give us best profits in compare to gold.