why crypto is better than cash:
it's more secure, as all computer have to approve of the transaction, and if one is changed while the rest aren't, it will not alter the balance.
it's faster, as the money doesn't have to go to a middle man, like a bank, before going to the person you wanna send it to.
less fees, as banks aren't useful anymore
you can mine it, so it's free money (aside of electricity cost)
you can't loose your wallet anymore