Commodity CFDs give clients exposure to the underlying commodity without the confusion of physical settlement. (home.saxo)
When you hold to maturity a long future contract position with physical settlement, you pay the final settlement price as calculated by the exchange for the underlying you receive and not your initial purchase price. (money.stackexchange.com)
«Physical settlement avoids those issues because you are not beholden to some abstract price that might or might not be manipulated. (links2exchange.net)