I use ceramic paints, Grahams mostly until they got bought out by California. They changed the paint for a little while but it seems to be back to the original formula now. Ceramic paint is easier to clean when it gets dirty and wear very well. I do a lot of work with Azek and as it holds paint forever it is important that is cleans well and holds color.
Paint is like shampoo, everyone likes theirs best, till they find a better one.