I have always wanted a Honda generator, but the price has always been too much.
So after making mistakes with a couple first cheaper generators decades ago I learned if you take care of them, even the cheaper brands last decades. Only use clear gas ( non alcohol ), change that out at least twice a year. Some say using a product like Stabil isn't needed for clear gas, but I use it.
Change the oil.
I had a 5000 watt Generac for nearly 20 years. It was wired into it's own circuit box ( Gentran).
I upgraded to Predator 8750 about 8 years ago.
I wholly agree that maintenance is important, and the cheaper the generator, the more maintenance is required.
I have owned maybe 5 generators, and worked with dozens of generators over the years form remote worksite power 10kW - 20kW to industrial power (mining) up to 400kW. With generators, you really do get what you pay for.
I will repeat the point about power output. Cheap generators use a cheap mechanical method to govern frequency. Cheap inverter units put out a poor waveform as well. Better generators put out cleaner waveforms at a steady 60Hz.
The predator generators are fine if you are willing to put in the work and maintenance, but don't have the greatest of governors.
The allure of the Hondas is the quietness, durability, ease of starting and ease of maintenance and quality of power. They are hard on the budget, but you get what you pay for.
Yes - ethenol free gasoline is a must if you don't want to replace the carb every year or two. Stabil is fine, but not magic. It simply floats on the pool of fuel and helps to prevent oxidization. Skip the sea-foam cult.
To drain or not to drain... you really should keep the genset dry if you don't fire it up AT LEAST once a month. Again, the nicety of the Honda here is the quality of the carb and parts. It will simply take more mistreatment in this respect.
I (quite literally) recently threw a 9kW predator away that had maybe 75 hour on it in 5-7 years. The needle and seat leaked, allowing the full tank of fuel to drain through the engine into the crank case. I simply did not have the time or desire to replace the oddball knock off honda carb or tear the engine down and inspect it.