Saving money in cryptocurrency is certainly more profitable than keeping money in a bank, but all of that is based on market movements too, if the price movement goes up of course we get double profits, but if the market movement goes down of course we will soon experience problems in our finances, my advice don't invest crypto with money that is used to fulfill your basic needs, because it will make you feel uncomfortable
No matter how much the price of Bitcoins move you will almost be guaranteed to earn more than the interest you earn from the banks on your money. In fact, people earning interest on their savings in the bank will be a victim of inflation in the coming years while the one who invests in assets like Bitcoins will never face such difficulties.
The only drawback of Bitcoins against fiat is the real-life use cases. You cannot spend Bitcoins at many places which is the only negative I can think of right now. That is why adoption is the real catalyst to the value of bitcoins.