vfc is usually known as a higher end brand while g&g is somewhere mid to mid upper in terms of quality. G&G also runs an entry level line called combat machine.
Given the choice of quality of manufacture, I would go with a vfc over g&g. I would also choose vfc over g&p.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.