Depends on mainly two two things- the condition and age of your paint and how often you use it.
Ultimate wax is a very good synthetic wax. It has sealant-like properties and offers crisp reflections and outclass clarity. It also offers incredible water sheeting and beading. This makes washing your car much easier because most of the water just rolls right off. Comes with a great applicator pad and a mf towel. It has a long durabilty of upto 2 months.
But if your black paint is old and thirsty, then #26 paste wax will make is deeper and richer making your car really stand out because it is enricged with carnuaba. Comes with an applicator pad only.
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