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VAF-C is designed specifically foor vtec motors, better (more) points of adjusdment, plus vtec engagement control and more. if you have Vtec dont even think of getting an saf-c
VAFC's can be used on both vtec and non vtec motors, unlike an saf-c. an saf-c on a vtec motor is not as productive. Vaf-c does everything an s-afc can do only, on vtec motors, can controll vtec engagement, has more points of fuel-timing changing, etc.
ill try to research it some more for ya so i can not try to explain it myself