Colour charged waxes dont really add any colour to the car, you could use purple haze on a white car and it wouldnt turn violet.
Technically, there is no difference in durability between a hard wax and a soft wax.
Practically, hard waxes tend to be more durable because people don't layer them so thick, so they cure better and don't get removed prematurely, and thus they last longer because they cure better.
But perfectly applied soft/hard waxes last the same time. It is just that most users see more durability from the hard ones, by a week or two.