We have chalkboards in our shop and use both chalk paint markers and regular chalk. We use the chalk mostly for coloring in and shading, and the markers for writing and outlining. The boards hold up very well. In my experience, I prefer the paint markers over chalk. They make the boards look clean and nice. But you have to use a strong cleaner to clean the boards after - like Simple Green or something. Depending on the size of the boards you will be using, you might go through markers pretty quickly. We order markers about once a year (through Hubert supply company) and we use them for ALL of our drink/menu/event boards (about 6 in all). ALSO, if your boards will be in reach of customers, I wouldn't recommend chalk...people can (and will) run their fingers through it.
Yes Eileen, I was referring to the paint vs boards. I know that I will be using the chalk markers (Chalk Ink has always been my favorite...I order direct from them). How long have you had your chalk paint up? Is it holding up?