Do you want to discuss it related to the use of Bitcoin as a payment tool or a digital asset?
If we consider Bitcoin as a payment tool, it is still too early to say 'Bitcoin better than fiat'. There are many weaknesses that Bitcoin needs to improve to be better than fiat. Bitcoin cannot be used in any place in the world as a payment tool, while fiat can be, especially dollar. Bitcoin also has too big volatility as a payment tool. It makes people hard to determine the value of Bitcoin as a payment tool.
While as a digital asset, there is no doubt that Bitcoin is more favorite than fiat. I bet people who already know Bitcoin investment, prefer to put their funds in Bitcoin investment than storing the funds to the banks. Bitcoin allows us to get much bigger profits than saving money in the banks. Also, it is easy to do it if we have had enough knowledge about it.