This is all up to personal preference! Using a dry rub allows for the pulled pork to build up a wonderful bark while it cooks low and slow. The simplest of wet rubs is mustard. You can easily put a coating of mustard on the pulled pork to act as a binder for the dry rub to stick to the meat. My preferred method is to use a marinade to inject into the pork butt before coating the outside with a dry rub. In fact, this is the method used in our Smoked Pork Butt recipe.