A few years ago I read a comparison of Sea Foam v/s Sta-Bil. at that time Sta-bil was only one formula, same for SeaFoam
The consensus was that SeaFoam worked well with adulterated gas (E-10) but Sta-Bil... Not so good, it did not play nice with alcohol.
Today I see Sta-Bil has a special formula for Adulterated Gas (Gas-ahol)
SeaFoam is what I put in my tank when the engine blew in 2014, and the generator still starts just like it did in 2014.... I'm hoping to get a new engine SOON. in fact I'm bugging the mechanic, theory has it he should be ready tomorrow but he keeps making excuses.