Both are good synthetic (meaning not carnauba based) sealants. If you are a casual car washer/waxer (no detailer/ non OCD) go with Klasse, a little easier to use. I am OCD and have no issue spending 2-3hrs each week on my vehicle and my personal preference between these two is the Zaino. if there are zealots on here you will end up with a tie I would predict.
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