If you are looking for a product to clean your fuel system and stabilize your fuel, you may wonder if Seafoam or Stabil is the better choice. Stabil is the clear winner when it comes to cost, as it costs half as much as Seafoam. Stabil is also the better option in terms of potency, as it is 2.5 times more potent than Seafoam. Therefore, if you are looking for the best value for your money, Stabil is the better choice.