Short answer: Klasse AIO/SG > Zaino AIO/CS
Long answer: Zaino got its start back in the 1990's by a man named Sal. He made it big by essentially using car enthusiasts as the heart of his marketing campaign. He did so by making many of them "testers," earning Zaino fierce loyalty from its adopters. This loyalty has little to do any form of product superiority.
Klasse, on the other hand, has been around for several decades - reformulated once or twice to accommodate new technologies and environmental protections. It is the elite of car care products and has even won several inventor awards.
I may be biased because I am a Klasse user but the last I used KAIO, this was the result: