I closed my business during Covid.
Optimum only have one ceramic coating available to the public, it has evolved through the years. It used to be called Opti-Coat, then Opti-Coat 2.0 and now Gloss-Coat. They have 4 Pro level coatings, the first three are really the same coating but with different percentage of SiC, the newer one, Opti-Coat Pro3.
Little history, Dr. David Ghodoussi, the owner worked for over 10 years in the research and development of automotive paint formulations, mostly the development of clear coats. So he set out to create a coating that help protect clear coat from UV exposure. Unlike most coatings in the market made out of SiO2, Optimum uses SiC exclusively in their pro level coatings. This is the reason why I decided to get certified with them, and not just buy other coatings out there.
I don't buy Griots Garage, never liked their products, but I know of people that had great success with them. For a first time use, Gloss-Coat is very easy to install, and at $60 for a 10cc syringe, the price is about the same for other companies out there. I recently bought Adam's Advanced Graphene coating to try out... although I still have several syringes left for Pro. I want to do a side by side to see if it is really different. I know it won't last as long as Pro, but I heard that the initial gloss and hydrophobic properties are better, kinda like the Pro+.