Fiat for daily use.
While bitcoin or cryptocurrency for investment.
It's the embraced use of cryptocurrency today but we have to spend it in the most possible way to enjoy it. I have used it to shop for many times but our society is not yet ready to go all-in with crypto.
It is like choosing whether pulling off your wallet to get some money or pulling out your phone cause you have something to scan and pay. Although I'm a huge fan of crypto, I would still choose the fiat since it is the one that we are using now and the complexity of using the crypto is not yet settled, there are still bugs and errors to be fixed. We are on the process of transitioning, sooner or later we'll be having it.
Fiat for daily use and bitcoin for daily transaction and updates.
When it comes to being practical, it is more reliable to use fiat in many transactions like buying goods or everything you want. But the way for you to increase your profit is through cryptocurrency. Cryptocurrency is like a business that you need to manage, monitor, and make a strategy where you can make it grow. Investment is also a factor why it is like a business, you should take a huge risk but the profit is surely high and can make your life change. That's why mass adoption is still developing that's because many people are continuously knowing the benefits of crypto.