No but I guess I could. What would you use the pdf for, as opposed to say taking a screenshot to get a png? Would you want the canvas layout rendered on a pdf (the one you get when doing View -> Canvas) or something else?
PNG is also portable of course, but it is always embedded in something else. Outside of the tech bubble it is going to be a "what-is-a-png?" for the average person.
Everyone everywhere (to a first approximation) can handle a PDF as a document. PNG as a document is problematic for a vast number of people.
Though my first choice would be jpg. Everyone knows how to use them and they can be embedded in other documents easily.