When I first started Q’ing I used mustard – not for any other reason but to give me a visual aid when applying rub. A few years ago I changed to peanut oil after I watched Johnny Trigg use it on his ribs. I really could not tell any real difference between the two but since we always keep oil in our cook box I use a little since it is there. I do notice the times when I don’t use a binder my cutting board has a lot more rub left on it than when I do use a binder.
I have always known that there was a mustard / oil debate but for the life of me I can’t understand why.