I believe all traditional (fixed speed) generators deliver exactly the same kind of power your house has (assuming they are tuned right).
But I don't think anybody will like contractor-grade generator run next to RV.
As already explained, inverter generators use DC alternators and then inverter converts it to 120V AC. Depends on the electronics in inverter the sine can be cleaner more or less.
The advantage of inverter generators is that they can deliver high power when needed for AC start, but once the amps are not needed they lower the speed to actual use, lowering the noise and fuel consumption.
The most popular Honda generators also do have advanced mufflers what makes them extremely quiet. I have Generac inverter generator that is not that quiet, but still beats older (pretty loud) RV Generacs and I like the fuel savings.
My older 4000W Generac was using honest 1 gall of gasoline per hr.
Honda EU3000 will ran 5 hr on the same fuel and load.