I typically don’t add any to mine. I like to let everyone put on what they want. It also allows me more flexibility on the leftovers.
The exception is when I pull a pound out of the freezer and warm it all day in the crock pot. Gotta add just a bit to keep it from drying out. The key to me is finding a mild sauce that doesn’t overpower the rub. I want to taste the meat, not some super heavy sauce and feel really good pulled pork is able to stand alone.
To each their own.