Seafoam is good and has the added benefit of preserving the gasoline if you plan to store the gas for a while.
Techron is a much newer type of fuel system cleaner that is entirely different from Seafoam.
B12 is similar to Seafoam (but no preservative0 and cost the least.
We tend to use all three in a rotating basic a few times each year.
It takes about 3 tanks of gas with additive to have much effect.
Scoot safely,