According to my views the marketcap of both of these will be the best tools to find out that how much people are holding bitcoins and how much people are holding gold. With that we can calculate all the things in a summarized form.
Total gold market cap = $7,617,683,440,065
Total bitcoin market cap = $14,460,218,610
bitcoin market cap = 0.189% of gold's
and now calculate that in how much time they both attained that value of marketcap and then compere the speed of both of them. So with that calculation we can see that how much bitcoin is favored and when will it go further than gold.