That's a good question. I tell people to buy something that both stabilizes plus notes that it deals with the woes caused by ethanol in the fuel. Me, I've used Seafoam, Starbrite, the Briggs stuff and just ordered the Kinetics stuff. Their claim is that it has 3 times the ethanol protection and comes in the fancy mouthwash type bottle. If it is stuff that real long term storage is needed, start with clear gas. The guy below puts out interesting videos on lots of relevant products.

https://www.youtube.com/watch?v=UvS_D4_lF5U

I currently use Startron fuel stabilizer . Seafoam is not a stabilizer but rather a fuel cleaner , that I still use when required !