If the question is, "why is bitcoin better than fiat money," the answer is that it cannot be debased, nor controlled by any person or privileged group of people. It is money that derives its price from the market (voluntary exchange) instead of by coercion and force. Thus, it is both a better store of wealth, andalso more ethical, transparent, and honest.If your question is, "why is bitcoin a better payment system?" The answer is that it often is not, at least formost people, most of the time. Eventually it will be thebest payment system, but it needs to develop further, gain more adoption, and get over the scaling obstacles. Even so, Bitcoin is already the best payment system for certain use-cases, such as sending money across borders, or receiving money from someone you don't trust (which helps further in cross-border transactions).