I did a quick search of 'xzilon'.
It's a "sealant" I'm assuming.
Personally, I'd stick with Zaino. 'Xzilon' isn't going to prevent scratches, etc., and I don't think it would provide much more, if any, protection versus keeping your car polished with Zaino.
I haven't read up more yet on 'Xzilon', but using Zaino alone, I have had nothing but positive results.