In my own opinion bitcoin is not really better than cash, It only happens that the value of bitcoins is very high and there is a lot of interest on it from different investors. People that are working in different campaigns are usually exchanging their bitcoins to real cash after the payouts has been distributed.
You probably do not have much understanding of what sound money really is. Things like censorship resistance, borderless transactions, permissionless value transfer and limited supply can make any cryptocurrency be far ahead of Fiat, and Bitcoin is already very advanced in that regard.