In my opinion, both are very profitables, because both of them are valuable and have the most promising potential. Gold is always trusted by people and it will never lose its value, and its price keep growing slowly. BTC however is increasing fastly and expected to become a lot more expensive in the future.
Its much better if we hold gold and bitcoin. Gold as known for centuries as stable asset, but with technolgy advance, bitcoin right now become popular and people already investing on it. Bitcoin can give us many advantages because in internet era, we can make transaction using bitcoin with low fee