For me Fiat currency. Fiat currency is currency which only has value through legal declaration. It does not have a promise from its creator of exchangability into some commodity of real value,example:- Gold ,Silver etc. Fiat currency are basically the Dollars, Euros, Pounds etc. that you spend. They are also known as the paper money.
Fiat currency is certainly safer even though the value of fiat continues to decline due to inflation but the total protection of the country makes the fiat last forever, but when the crypto trend is popular then we must invest on crypto to make money increase.