NXT is the preferred wax when it come to light colors by Meg's. Its a completely synthetic wax meaning it has no carnauba. For car's that do not reflect the surroundings ( white, silver ) using a carnauba wax is considered kind of pointless. No matter what wax you add, you wont get the reflections you might see on a black, metallic car. A synthetic wax adds gloss and shine to lighter colored paints and that is exactly what people prefer on their light colored cars.
Before you wax, make sure you do a proper paint preparation. Paint prep matters alot. Even on a lighter colored car, paint prep can actually result in better reflections than the wax itself.
Benefits of NXT. Its a pure synthetic wax, adds gloss and shine, has masking abilities to hide swirls and hydrophobic abilities. Read the reviews of the nxt vs ultimate wax on international forums for lighter colored cars.