If you only trade spot, using FDUSD is a good idea especially if you are looking to minimize fees. FDUSD is a popular choice because it often offers lower fees when trading it compared to some other currencies such as USDT or BUSD.

But make sure of the following:

1. Liquidity: Check that there is sufficient liquidity on the pairs you are trading using FDUSD.

2. Fees: Check the fee structure of the platform you are using to make sure that FDUSD is the best option in terms of fees.

3. Security: Make sure that the currency is well supported on the platform to ensure smooth operations $BTC