They are both different means source of profit. Though we cant tell if one day bitcoin surpass gold the point is both of them has value.
It could be same for you but not for me as according to me bitcoin is valuable than gold and it has more profit than investing to Gold. According to me now gold has become an old investment and people are no more interested in it. They like bitcoin only for huge profit and proper security I am sure bitcoin will surpass gold very soon.
Yes bitcoin is the most popular currency in the world and that's why everyone wanna buy this currency because they know it will the future surpass gold and their life will change by its profit so most of people are very fast to join this currency and that's why they invest their money and its price very low but very soon it will super high and profitable and it will proof that bitcoin is really powerful currency.
Both Bitcoin and gold has some uniqueness on each things because each one is developed from the beginning stage and it developed and stable for today situation but gold is more trusted by people since from a long period so we cannot say gold is not better than Bitcoin but Bitcoin is better than good so it will be definitely underestimated by the people and the government also so it can be develop into a huge success.