I would choose for gold, I love long term investments.
Also thinking that gold has a better future in a long term.
Although the bitcoin is the future of all currency's
Bitcoin can also be the best as a long term investments if you hold it for really long time, and I am sure it will give you best returns in compare to gold in future.
I agree, bitcoin is a good thing to consider as a good long term investment but they are just the same with gold.
It will just depend on how you are going to be more productive to both of them.