Pinnacle Souveran or P21S (also known as s100), deepest wettest looking shine comes from the souveran but it better for the price. s100 is also available at Harley dealerships which makes it readily accessible. Neither is real durable but I also wax every 2-3 weeks so it really doesn't matter to me.
Zaino sucks on black, been there, done that (several times). Good shine, great durability, NO DEPTH (and yes I layered it over a 1 week period, 7 layers as a matter of fact). I like it on some silvers though....
I could use almost any carnauba and come out with good results, some wetter looking than others. It really comes down to the amount of time you spend prepping the surface, and for some of you zaino guys that means more than a clay bar....actually polishing, putting a nice glaze if you want (makes it even drippier on certain colors), sealing, then of course the final step of waxing. Then maintain it with a spray wax (optimum is good) between washes to prolong the life of the wax.
Some Zaino guys do a great prepping job and as I said I do like it on silver, just not black or red.
From a mequires perspective, #26 is a good carnauba, not quite a good at the afformentioned two though.
My process on paint with significant swirls and minor light scratches:
-Optimum Compound
-Blackfire ceramic polish (yes I know it's make for the mercedes and such ceramic paint but nothing finishes out like this one)
-RMG, Red Moose Machine Glaze
-Poorboy's EX
-Souveran or P21S
-Optimum spray wax after washes and Optimum Car wash