Some people will say that Fiat is trash and they keep all their money in stable coins, the truth of this is you are doing things wrong, the stable coins in crypto space are backed by nothing, they can vanish into thin air if the government doesn't want stable coins to exists.
Fiat is not junk money, but everyone knows that saving in cash is not profitable because of inflationary pressures that can cause fiat values to decline. In addition, in some countries such as Zimbabwe and Venezuela, cash is so worthless that it is a sign that fiat is valuable in the right country in the sense that the exchange rate is high.
crypto is a storage that is being enjoyed by many people, besides being profitable, transactions are also easy and fast so that many people switch to the world of crypto but the theft rate is very easy in the digital world, prices are less stable, and the value of money is difficult to predict. Regardless of which one is more reliable, it's back to yourself, but everything has benefits and uses.