As BTC, Fiat and Gold all three have both pros and cons. which one is better for multiplication of money in present circumstances and where risk is found.
Obviously fiat is something you'd use for your day to day expenses because there is no other way. But you don't hold it because all fiat currencies with unlimited supply have inflation and will lose value over time.
As for bitcoin, since this is a bitcoin forum obviously people say bitcoin is the best! If you look at the charts you can see that it really is. But it is even better in long term. For example 5 years ago in 2020, price was $3000 and in 5 years it has gone up to $100,000 which is a 3200% rise. But if you look at the past 3 months, price hasn't changed that much.
As for gold, gold profitability depends on circumstance. Normally its price doesn't really go up that much but from what we've learned in the past 2-3 years is that with increasing global tensions, the price of gold can rise significantly making it a good investment. In 2025 gold price is at its peak, it does not have the same potential to rise as it had 3 years ago but since the global tensions are not subsiding it still has some potential to rise.