Ceramic is the current upgrade from SiO2 coatings. What is it that you want it to do?
Most people who get a professionally applied coating do so because the finish lasts longer and say it keeps the car cleaner for longer and washes much more easily - some just swear they only have to jet wash to clean the car.
You can apply it yourself, but you need to know how to prepare the surface and keep the car away from water for 24 hours - some products may cure faster.
The pro detailer products cost double or more but need to be applied in a fastidious manner. The main cost is labour (and experience)
Lots of people just settle for spray on products and refresh regularly.
I stick to my favourite wax because it provides exactly what I want in terms of ease of use and finish.
Ceramic finishes are harder on the Mohs scale
So, it all comes back to what are you trying to achieve and how?
Imo the main function of a top dressing is protection from UV (the knickers) but users then have additional requirements…be it ease of maintenance/use/look (the fur coat)
What are yours? A trustworthy professional will establish your requirements before recommending a final finish - bearing in mind that the majority of the cost is in the preparation.