The carnabua and no carnauba factor is the MAIN difference. I've found that both work decent on windows and buff out evenly for the most part. Obvioulsy the one with carnauba is more desirable for waxes that have carnauba in them. Thus, the quick detailer with carnauba will look nicer than the one's without and will of course rejuvenate the carnauba wax that you have on your car. Then there's the Final Inspection. It has much more lubrication, in my opinion that the quick detailers with carnauba. This is why it is my favorite product to help remove bug debris and bird droppings, etc... I just get the feel that it is more effective for this task and thus a bit safer. If you don't have some FI, then you should consider getting some. $20 or so for a gallon at carcareonline. And then, there's the factor of using a non-carnauba product for buffing out SG but you already know that. Laters.