I have tried using wood chunks in the PBC and I prefer not to use any.
Kingsford competition charcoal gives me tasty smoke flavor without additional wood.
As for chicken I go with Ozark oak lump charcoal and a small chunk of Cherry wood buried at the center where I normally dump the lit coals, when I want that dark color on my chicken.
But even with chicken, 9 times out of 10 I'll go without wood chunk.
Other than that, no wood.