There is typically quite a difference in quality of rotors when going from the way cheap to the moderately expensive units. I'd say look at them both and see what kind of quality differences you can see just by looking at them. Check the two friction planes (where the pads contact the rotor), they should be very similar in thickness. Usually, not always, but usually there will be a significant difference in thickness on the Chinese units as opposed to the domestic produced units usually being rather equal in thickness. I have run both and I now prefer the domestic units.
Pad quality varies greatly. A good quality (Bendix, Wagner or first line Raybestos) original equipment composition pad should serve you well. For the last 10yrs+ I have used only the Bendix Fleet/Metlock pads and I have never had a noise or excessive dust issue with them, they last a long time and the rotors do as well.
