I actually use both. Nothing beats the cleaning power of Techron plus it boosts octane and use it for keeping FI clean BUT it doesn't stabilize gasoline for storage. Seafoam cleans well and stabilize fuel for storage but no octane boost. I use 1 Oz of Seafoam in a fuel can to 1 gallon of non-ethanol fuel in every tank to keep things clean and a gasoline stabilizer in all my scooters.