Bitcoin and fiat currency serve different purposes, and each has its own set of benefits and drawbacks, in my opinion. In general, it's the same, but in my opinion, bitcoin is better than fiat. However, the problem right now is that if we adapt and use it for different payment systems, the fees are quite high, and some people can't even complete a small transaction due to the fees, so I still believe that fiat is better than bitcoin when it comes to payment methods.

In terms of investment, bitcoin is unquestionably the best asset since, unlike fiat, we can instantly profit with the appropriate timing and analysis. In contrast, it takes a long time for currency to expand, and only large investors will benefit from it.

When it comes to security, I believe both are fine right now; fiat is secure because it is centralized, and the government will not allow the fiat system to be destroyed; bitcoin is secure, IMO, because nothing has changed in the past few years; my BTCs are still in my wallet, and if you lose it, it is most likely your fault.