You will be using a quick detailer much more often than you will a spray wax. For instance, you should be using your quick detailer during your drying process each time you wash the car, whereas you may only be using your spray wax every third or fourth wash. A quick detailer doesn’t offer much in the form of durability, but most spray waxes do. I will use a quick detailer to remove/prevent any water marks or streaks and to add some gloss in the process. I use spray wax when it needs a shot of gloss AND protection.