The shop I was doing my PPF at work with Autotriz, haven't heard of it before but after reading the website it seemed interesting so decided to give it a go.
Autotriz ceramic is polysilazane based, most of the others are silicone based, the main difference is that the polysilazane bonds better with the material underneath protecting it better (in theory)
Here's the website for more info:
https://www.auto-triz.com
My friend uses Gyeon and recommended it highly!