First you get what you pay for.
I have never had any problems with any of my Honda or Yamaha generators.
I have seen time after time where Generacs break over and over and if you have ever had one in a RV they are loud and known as Clack clack bang generators.
Yamaha and Honda are super quiet and very fuel efficient.
But if I had my choice for quiet long lasting fuel inefficiency I would get a ONAN. Onan makes models that run on propane as well so if you do not want to slug gas cans these are a great choice.