Conrad
the boost control option on the PFC is crap, yes it does the job but no where as good as the AVCR.
the SAFC does the fuel side and allows manual advanment of the timing. while the PFC controls the fuel and timing and has more tuning points.
drivability isn't that different, but they main guide i'd go with is if you plab on upgrading the turbo in the future. if so go the PFC as the safc just want cut the mustard once the stock injectors reach 100% duty cycle.
to answer Andrews (peakRPM) question the PFC would give a better power return due to it controlling both fuel and timing and having more mapping points.It would also allow you to do further mods more easily in the future such as bigger injectors, turbo etc.