Bondo is a brand. Guys who do a lot of body work swear by Rage Gold (don't remember the parent company that makes it) because it is easier to work with than original Bondo and they're not paying for the stuff themseves. The Bondo Gold is a response by Dynatron to the popularity of Rage Gold. They should be quite similar if not exactly the same. Price is close, too. If you're not doing a lot of work with the stuff all the time, you can get the same final results with basic Bondo, it just might take a little more time. If you do a lot of work wit hit all the time the Gold blends save time and in that way money (assuming that you're doing this for a living).