Zymol is a cleaner wax. It is a combination product that cleans polishes and waxes in one application. Keep in mind that it does not clean or polish as well as a seperate cleaner or polish, but will give nice results for a one step product. It will work best on a car with minor swirls and little or no oxidation.
If you decide to use a polish/glaze combo, use a wax that has NO cleaning properties such as s100 or meguiar's #26. The reason these waxes are preferable when doing a multi-step detail is because putting a cleaner wax on top of a glaze would actually take away from the look and overall gloss. The cleaners would in fact erase some of the work you did. The waxes mentioned above are actually designed to enhance the look of a car when doing a multi-step detail. Hope this helps.