Probably me. I use both. Sta-Bil in the yard equipment and generator and StarTron in the Speedster, only because "Dave the NAPA guy" told me it sold better than Sta-Bil.
All of my power tools start right up at the beginning of their respective seasons and I have never had fuel problems in the speedster.
I also give everything a triple-dose of Sea Foam in a quarter-tank of gas once in a while just for good measure. It's cheap insurance.