Cryptocurrency works with the internet so that if there is any internet interruption then there is no transaction, this is of course the state's consideration to use cryptocurrency so I think the current currency is better than cryptocurrency.
Keeping both is better than everything but currently I prefer bitcoin although cryptocurrency is based on internet but I dont believe that in the currency technology based era internet may be demolished in the world. Fault may occur but it will recover soon because except cryptocurrency mostly technologies are based on internet existence so how can we say that internet will shut down.