I use both, have for many, many years ...Stabil is primarily a fuel stabilizer for long term storage, but helps thru the season if the boat does not get used often. I use seafoam as an engine cleaner, really helps maintain a smoother idle. Lots of folks call them snake oils and other names but I find them helpfull. In the past I have used seafoam to clean out nasty carbon fouled engines and carbs with great sucess. The stabil also helps keep moisture out of fuels and I use it in all my toys from lawn mowers, Side x side, chain saws, etc, and add some seafoam on ocassuon to keep things clean internally. After over 30 years of using these products, I have never had an issue with my engines starting after setting. My boat starts right up in the spring, and my snoblower starts on first or second pull at the start of winter. By using these products, I keep the fuel tanks full in the off season and the fuel stays fresh with no sign of water. Never in the last 30 years has an engine not started right up instantly and I use E10 in all my engines. Many might not want to spend the few dollars for the additives, but for me...wouldn't be without them !
