Can't speak for other brands. I have the Honda EU 2000 and Kubota 6500 diesel. Power outages around here are typically 2 to 3 hours and we use the Honda to power lights, internet, pellet stove and TV. If the outage looks like it will be longer, then I fire up the diesel to run the whole house. The 2000 is only 120 volt, so if you had any 220 volt loads or running multiple things with motors Honda makes inverters up to 6500 watts.
During the winter, I keep the Honda in the entry way closet with a couple 25' cords. That way its nice and warm and will start right up when needed. Just move it outside, open the tank vent and let it run.
Nice thing about the Honda is it can run several hours an a gallon of gas, the diesel burns about a half gallon per hour.
Hondas are also maintenance friendly, easy access for changing oil and plug. Don't know how the other brands are set up.
As others have said, you get what you pay for.