I heard from a paint guy years ago that regular white paint was the most durable. It stays cool, which is good, it is extra-hard, and when it chips, some layers tend to stay on the car. I suspect that pearl white isn't quite so tough. I'm sure it's got a clearcoat on top, and that clearcoat is just as delicate as on any other color. But you still have the temperature advantage, and perhaps the advantage in not showing swirl marks so much.
I personally find pearl white looks great, but only when it's clean. When dirty you can't even tell it's pearl. In the RSX, I think the pearl white is one of the best looking colors.
My understanding is that to protect the point, carnuba based wax systems like you're using now work fine, as long as you apply them often enough. Zaino is a more expensive and complex system, but it should theoretically protect the paint longer.
I recently switched from using carnuba wax to Zaino on my '97 GS-R, and so far I'm very impressed with the results. I did the whole treatment with clay bar, fancy towels, and all. The car looks better than it has in years. But that's with dark green metallic paint. So what do I know?
