According to the MSDS, Star Tron Enzyme Fuel Treatment is >95% heavy naptha with >0.5% other solvents. To me, that is just snake oil. A heavy naptha will clean carbs and injectors and probably absorb some moisture better than gasoline, but not that much better. And what is an enzyme going to do in a combustion engine? That's as ridiculous as claims that "oxygenated" bottled water has some magical properties.
Again from the MSDS, Seaform is a proprietary solvent mixture plus isopropyl alcohol. The alcohol is what makes it a good fuel stabilizer as it helps to prevent water from falling out of the gas, which is a problem any time with E10 gas, but especially when it sits for long periods with changing temps.
Both products will clean carbs and fuel injectors some, but, if you want to clean carbon and varnish from carbs and injectors with a gas additive, injector cleaning additives with PEA (polyetheramines) do a much better job. Techron, Red Line, and Royal Purple (my choice) are among the best in this category.