Are you talking about one of those 'whole house' generators? If so, what brand do you like?
Not a whole house. Portable with a plug-in outlet on the side of my home. But I can heat the house, cook on the electric stove top, use the TV and light the house. Just can’t use the AC.
And it is noisy.
Ours is whole house and runs on NG.
Never have to worry/mess with refilling it, or the noise
Flips on, automatically, once we lose power. Which can happen, often, out where we are.
Generac is a trusted brand as well as Onan. Keep in mind you must have a reliable fuel source. Above ground diesel tanks if you live in the country works as well as buried propane tanks. You can bury the propane tank down to the valves/regulators so as not to have an ugly tank exposed.