I would choose gold, because it passed the test of time. I understand that Bitcoin seems very perspective now, but it's been only 5 years the IT developes really fast. Although it developes fast, gold doesn't lose its value. I think I would get 70% in gold and 30% in Bitcoin just in case.
I agree with you that gold is a good investment but I think that the bitcoin also has a great future and its more profitable on all kind of terms.
With other investments as gold its more stable what is normally better, the only thing is that the profit will wait on itself longer.