For dark colors, i use dodo juice purple haze.
Last car was white, i used it on there and worked well too. The main thing i aim for is longevity. But keep in mind, the wax will only last if the car is prepped well.
I don't buy into that whole swissvax garbage. I was tempted to use swissvax, and when I contacted a detailer about it.. I asked how long a coat would last me. I laughed, and bought more Dodo Juice.