they both are good source of investment but if we see for the long term perspective gold is less risky because it can be seen in early years that price of gold rises in 10 years very strangely. but if we see bitcoin as long term investment yes its risky but bit coin would go much high according to me but you have to invest in 5 years of interval.
Yes both can be consider as good but i think that if we want to make a quick profit then we must choose bitcoin, because bitcoin is in fact the best option to make more and quick income. While gold is better to saving where one can keep safe their money for a long long time.
At the end it depends on what you are looking, for those that very comfortable with their level of wealth then the only thing they need to do is to buy some gold and they are set but for us that are looking to make more money then the right thing to do is to invest almost everything in bitcoin.