Unless you get an unusually large hunk that has extra thick bark, it makes little to no difference. Same holds true for most all smoking wood. The bark is where the "bitter" comes from. Most packaged and sold brands are suitable as purchased. Where you have to be careful, is when collecting your own wood to smoke with. Take extra care to remove as much bark as possible, and make sure that the wood has sufficient time to dry out before using. Uncured wood is the number one cause of "bitter" smokes.