The Zaino gives a very clear shine that to me is a little boring. If you play electric guitar and like using no effects you may like Zaino.
The blackfire gives the color some extra punch, sort of intensifies it. I happen to like this look. Not that Zaino is bad it's just a Preference.
I have to say the Z5 does not fill in small scratches or hide slight imperfections at all on the cars I used it on.
Zaino does seem to protect longer though.
I guessed right on the pics. Just did a red Audi today.
Your PC may go to 7, but the shine on the Toyota Goes to 11.