We might be a little biased because we sell and install Ceramic Pro, so that would be our recommendation for the best protection and least amount of maintenance. In our experience, CQuartz is softer and easier to scratch. Heard good things about Modesta, but of course out pick would still be Ceramic Pro.

However, if it's something you want to install yourself, you have a whole array of good products you can use. Everything from synthetic waxes to carnaubas. Just depends on how often you want to reapply. The Wolfgang synthetic stuff is really good if you want something for application at home.