Actually, to shed some light on the question I once heard a rumor that magic craftsmanship is for success while craftsmanship is for quality. I decided to screw around with this on carp, bsm, arm, gsm, and alchemy. I varied the synths and spent only about an hour or two with each and, after screwing around, found the rumor to appear true. Then again, who knows with this game?!

That's just my experience with some shallow testing.