I am not married with any of them but I do prefer the Hangar 9 Fuel dot or plug or what ever you name it. I also have other planes with the Quick filler valve and I have had not problems untill now, I believe that the oldest I have should be around 5 years old. I do prefer the fuel plugs because of their price and when the engine is completly inside the cowl I use a couple of them with a T, then I am able to catch the overflow fuel inside an extra tank that I use to carry in my tool box.