The beauty of cryptocurrencies is that it is purely online and thus, it is easy to use and available for use in a lot of places in the world. It cannot be diluted because it is not regulated by any central bank or, authority. Your coins cannot be seized and unlike bank accounts, there is no monthly or annual fees.
Due to its digital nature, it cannot be counterfeited unlike fiat currencies. It can be transferred between users like an email and thus, it is relatively private with no risk of identity theft. Lastly, cryptocurrencies uses cryptography and this makes it hard to breach. In addition to its digital nature, this makes cryptocurrencies safe and reliable.