Some of the reasons, why I use Bitcoin.

Fiat money is inefficient for cross-border payments, which are expensive and may take days to be settled. While, Bitcoin can be sent and received by anyone, anywhere in the world at any time, without relying on a financial institution.

Fiat money promotes discrimination, censorship and manipulation, since banking options are not available everyone. While, Bitcoin can be sent and received by anyone, anywhere in the world at any time, without relying on a financial institution.

Merchants, who use fiat money, need to work with a payment processor and pay transaction fees to accept payments which are subject to chargebacks. While, Bitcoin transactions are irreversible, suitable for merchants to avoid chargebacks.