The reason why some people prefer bitcoin over fiat is the fiat currency and any national currency decreed legal by the national government, but is intrinsically valueless money. Fiat currencies no longer represent gold deposits or other things of known market value. They are just the accepted pieces of national paper, printed by a private central bank and loaned to the national government, with interest. All fiat currencies are debt instruments. Example is the U.S. Dollar and other fiat currencies certainly have their own inherent advantages, which mostly revolve around their acceptance by the banking systems that create them. These will prove fleeting in the coming years, whereas Bitcoin’s advantages are built into the technology, can be amended or updated through the protocol, and are built to stand the test of time.