I was thinking about this today for a while and perhaps we can discuss about this forever as forever prices of btc and gold will be changing.
It is not easy to say what would be better for long terms. It is so hard to say what is going to happen with bitcoin in next 10-15years, and it is indeed very hard to say what will be price of gold.
Perhaps in 10 years we will be making jewelry from cosmic stones mined @ asteroids
But we can see that gold is with us from hmmmm loooong time
and gold jewelry was always easy to sell.
yes you can say - why I am talking about jewelry - like it is most important to keep the gold price?
Well indeed. Even if people keep gold stabs for money in the future - at the end their gold will finished as a jewelry or some golden toilet or other golden toy - a car or something - (so I called it all jewelry).
I think putting "gold and bitcoin to the same basket" as some user mentioned before is wrong.
And I would add - anything what we will say here : Speculations.