Fiat is still more better than bitcoin with the following reasons:
1) population: Fiat is still more popular than bitcoin in the world. There are some countries in the world, don't care to know bitcoin in their country based, they are use to fiat.
2) control by the government: Fiat money is control by the government. Government know when to make it pump or dump because they have the power to do that in the country.
3) Very easy for uneducated people to operate .
Except for the third option, the other two do not make fiat better than Bitcoin. That something is more popular does not necessarily make it better, and that the government can manipulate our fiat money precisely makes it much worse than Bitcoin.Thinking about it is the other way around, BTC is better than fiat money because it is not controlled by any government, and being a deflationary currency and not yet as popular as fiat, you can even get rich adopting it early. Regarding that it is more difficult to use, once you learn it, it's easier for me to use BTC than fiat, but it is true that you have to educate yourself a little before. In any case, cryptocurrencies continue to evolve and are increasingly easy to use.