no it's not, they're both bogus.
a sound money system is where i can take whatever token is issued (paper, coin, digital, whatever) to the money warehouse and exchange it for silver or gold. this is its guarantee, its backup that it is worth something universally recognised as valuable.
while we are in agreement that fiat dollars, euros, pounds, yen etc. fail this test (though they didn't use to - a 'pound sterling' used to be able to be ex changed for a pound of sterling silver at the bank of england, and there used to be gold and silver dollar certificates as well,) it is also true that all current cryptocurrencies also fail this vital test. they are backed up by nothing but trust + belief, making them inherently worthless.
that won't stop the rulers using them as future digital cash so they can completely control the economy and therefore mankind though.
A valid point