Well, I don't think that Steve had only profit on his mind when he said this! I believe he was referring to what Bitcoin really is, and how helpful can be for uniting the world...
I don't think we need to rely on Steve to know Bitcoin is better than Gold. With Bitcoin, you have privacy and borderless transactions, digitalized, decentralized and so much more.
Bitcoin's total supply is unchangeable 21 million. Gold's total supply is infinite because human can mine more gold on Earth or on other planets.