Still I prefer gold as the most sustainable one but the saving system for gold and huge transaction is not so convenient here. But crypto has its drawbacks including the security issues for common people without proper Knowledge on the security and they can be prey to the hacker easily.
And another one is the governing body of the coin or token issuer, they become billionaire without any conceivable realization from the general people.
Hope more decentralization with 0 premined and worthy access of the system could evolve to solve these issues in near future.
It shouldn't be like free money and sudden collapse in the marketcap and price goes to zero.