Lawnmowers and Tractors (Toro SR4 with Briggs Quantum, and a Simplicity Coronet with a 13hp Kohler Command) get Amsoil ACD. I think it is a hard to beat oil for air cooled engines.
Briggs 3500 watt Generator- Amsoil ACD in summer and GC or Amsoil SSO in winter.
Snow blower gets GC or SSO.
Two cycle stuff gets Amsoil Saber at 80:1 or Stihl HP Ultra at 50:1.
Some people laugh at me for over maintaining my OPE equipment. But when I need them to work, they work!! My sump pump runs a lot in spring, and I get frequent power outages during storms. This is not a good time to find out if your generator has stale fuel or 4 year old factory oil when you need it to run for 12 hours. Call me crazy, but a few ounces of fuel stabilizer and a couple of quarts of syn oil are cheap compared to a flooded basement!