In my experience, GFCI breakers exhibit more of a tendency toward nuisance tripping than the receptacle types, particularly when feeding a very long branch circuit run, or just about any length of old cable. I presume this has to do with leakage to ground (either resistive or capacitive) in the cable run.
Putting the GFCI at the point of use avoids tripping from these leakage currents. The receptacles are also generally less expensive than the breakers....
