I love them both and I think they both have their up and down sided, as a example you cannot pay with gold and with the bitcoin you can all over the world.
Bitcoin is unstable, the gold is pretty stable.
Not quite, maybe in a short time spawn, but when you look at its last 30 years you get something like this:

As gold is much older than bitcoin, we would need to wait to can compare stability.
bitcoin is still young though compared to gold but still on terms on prices i could somehow say that bitcoin would have the edge regarding to it but if i have the capability to invest into both then i would surely invest on both bitcoin and gold because they have all the potential to make profits on long terms