Actually I'm pretty sure all the replica fogs are made by one company and distributed out. So in reality doesn't really matter where you get them from, its all the same replica fog.
Differences in replica fogs is:
Fitment-allthough replica is good, oem fits better
Light out put
Plastic lens
I've owned replicas for short time they are nice product for someone not to concerned about not having a non oem part on their car, they are cheap and easy access to buy another set if something brakes. Foglights are going to chip its just matter of time, oem fogs or not. In the end though oem is better product but you half to pay for oem quality.