Which one of the following is more preferred by potential employers, web designers or front-end developers?

I want to know which one of one those are more preferred by employers. As far as I know, a web designer designs the layout of the page while a front-end developer does not only designs the page if assigned to, but also add functionality to site as well. Do employers make a strict distinction between the two, or merely overlap them both out of indifference? Also, which one would be more advantageous?