These are mainly just surface treatment, there is no difference in tone. Surface out of the different, is the difference between the product aesthetics and corrosion resistance, of course, choose the best gold-plated. Other new when you can, but the use cycle is not as good as gold-plated, silver-plated nickel-plated for a long time to be discolored with an oxidized layer, which over time may cause the sound to run off, the appearance is also relatively eye-catching.