Bitcoin can or cannot be better than fiat. Various fiats are struggling to cope up with the global crash. In such a case, Bitcoin could be helpful. Now, for a well-regulated country, it is obvious that the fiat is doing adequately to the economy. There is no need for Bitcoin at all. If we compare the speed, cryptos are better than physical money. Transactions can be done in a few minutes and you do not need to put your hands into the pockets to bring out cash. With cryptos, you can spend anonymously. Bottom line is, both have their merits and demerits in different situations.

Sources>>  https://www.cryptoknowmics.com/news/list-of-stable-cryptocurrencies/