Here's a simple idea for you guys disagreeing over Carnuba vs. Zaino, a topic of which I'm very knowledgable. Zymol is a pure Carnuba wax just like many others, Pinnacle, P21S, Blitz, etc. These are usually very easy to use and put a unique gloss on your vehicle that many prefer to synthetics. Usually, it's a little wetter or glossier, but most notably, a deeper shine.
However, then there are the sythetics. Zaino, Klasse, Blackfire, Platinum, etc. I currently use Klasse topped with Platinum because I get tremendous acrylic/polymer protection, but because of the Platinum (a polymer), I also get a look very, very close to a Carnuba wax. But, my next step is Zaino. Synthetics are often disliked by some simply because quite a few give more of a "plasticky" or sterile shine when compared to a Carnuba or other polymer. But, the fact stands, no Carnuba will ever last as long or PROTECT as well as a synthetic. This is especially noticable in the summer heat, because Carnuba waxes melt, while sythetics remain unfazed on the paint.
Here's a good rule of thumb. If you like the look of a Carnuba and having to re-apply it more often, go for it. What I would definately recommend though is starting with a coat of an acrylic/polymer first and then topping it with a Carnuba. Klasse is an excellent product to use for this method, and you will get UV protection unlike waxes.
Zymol is a terrific wax, just like many other Carnubas, but I still won't use then on our black Av. Why? It sits outside in the elements 24/7 and I need excellent protection along with a trully amazing shine. Thus, months later, our Av still has the same look, feel, and protection as the first day when I applied the latest layer of "polish". Even better, any water still bubbles and rolls right off the surface so well, it's amazing to watch!
Use whatever you like best, and leave it at that! But, the facts of what protects better and last longer still remain.
I don't know if I missed it, but on the Wax Guru test, which product was rated the highest??