Al, I like oak and hickory. Adds a real robust flavor to the meat. Since I do a high heat cook I can really pour on the smoke to the brisket. Foiling the brisket on the smoker allows a lot of the juices to collect in the foil as it renders to cut down the harshness of the smoke. It gives you two things . A nice flavor to the meat plus great drippings to use in other dishes. Occasionally when I feel adventurous I'll use mesquite. I leave the other woods such as apple,cherry, pecan, and maple for the meats that seem to do better with subtler flavors. This includes fish,chicken and ribs. PB on the other hand can take almost anything since you usually pull it and mix exterior meat with the interior meat