Bitcoin is digital and decentralized – With Bitcoin people get the liberty to exchange value without intermediaries which translate to greater control of funds and lower fees. It’s faster, cheaper, more secure and immutable. Cash is controlled by banks while bitcoin has owners.
Less volatile than cash: Bitcoin has a global acceptance and is less volatile than cash / local currency. Due to this feature, it becomes easier to conduct transactions across boundaries and online.
No real way of keeping a track of conventional currency- The underlying technology behind bitcoin, which is, blockchain is what makes or breaks it. Thousands of computers in a distributed network use cryptographic techniques to create a permanent, public record of every single Bitcoin transaction that has ever occurred. This record will be very valuable for various things besides tracking payment. While there is no real way of tracking cash.