For one thing, if you want to go the breaker route, you can get GFCI breakers for your existing box (just make sure you match manufacturers because breaker panels aren't standardized. A Square D breaker won't fit in an Eaton panel). This adds GFCI protection to every receptacle on the circuit but does require you to identify the neutral wire for that circuit and move it to the breaker.

If you go this way though, you are further investing yourself into that manufacturer's ecosystem.

The GFCI receptacle adds protection to the receptacles down the line. It also adds the benefit of having the test and reset buttons in a convenient location. This does require you to determine which receptacle is 'first' in the chain. So you don't need to replace every receptacle on the circuit to have the protection.

I hope this helps. FWIW, I am not a licensed commercial electrician. I deal with electrical supply professionally, but it is all temporary distribution, so we don't deal with the same codes and all of the infrastructure is in the open.