There is a major price difference between quart containers and jugs of oil....based on the cost of an ounce of oil.
It pays, when possible, to get the Jug. Most of the quarts that I've accumulated are usually sale or clearance item quarts that come out to less per ounce than the jug. The sales on quarts is usually less than the comparable, per ounce, price of oil in Jugs.