If you had to convert all your wealth to either Bitcoin or gold and keep it there for 10 years, which would you choose? Keep in mind the fact that Bitcoin has only been around for 5 years, and could be fundamentally different in any number of ways in 10 years.
Comparison between Bitcoin and gold, Bitcoin is a real currency unlike gold you need to sell it first before it become a real money. Bitcoin is very safe and secured while gold is not very safe and secured and there is a chance that can be steal by the thief.
Your bitcoins can be stolen too but by a different type of thieves which is called a hacker. I think gold might even be safer because you can deposit it in a bank or a vault somewhere safe. Actually, you can use gold as payment too if you try to look deeper but mostly in huge amounts only. Back then, people are accepting gold as payment for really large transactions and people are converting their money to gold a lot since gold holds actual value while paper money is simply a paper. Same goes to bitcoin, bitcoin is simply an online coin. Without any user, it doesn't have any value at all unlike gold that would always have value with or without user since it has other purposes.