I think cryptocurrencies are way better than the regular currency.  Cryptocurreny come with so many advantages,  like It's global currency, meaning you can transact to different countries it's easier since you don't need to convert your local money to their local money.  Whereas it is not that much easy in regular currency. Though both are financial instruments, but it has quite different  used. Fiat or paper money is used daily in our daily needs from groceries,food transportation and many more while bitcoin is mostly on online transactions.We are not well connected digitally where we can used bitcoin for anything.Possibly in the future it will happen.