SOmething about horses and barn doors---but I was able to do a quick and pretty good study on generators. Here's the skinny.
1. if you have sensitive systems to power, like computers, routers, newer tellies and fridges, you will be better off with a generator with an inverter, which produces power about equal to the purity you get from your household sockets from the electric company.
2. if you want to power the whole house, a whole house generator can be rigged to turn on automatically whenever power goes out, to protect things when you're not home. This will be fine for most purposes, but not so good for really sensitive electronics.
I rely on a laptop for a living, and cannot heft a 170 lb full house generator, so this is our plan for future disasters. A Honda 2000 inverter generator, of the sort used in tailgate parties, 42 pounds, producing 'clean' power. I can keep laptop charged, bring the router up for the internet for specific jobs, unplug that and run the microwave to get coffee and hot meals, while using an ice chest for perishables, and meanwhile run the fishtanks and the heaters, running the lights intermittently. It's a bit of a merry-go-round of plugging and unplugging to stay within the 1500 watt running power of the generator, but it's way ahead of getting up every four hours to pour 50 gallons of water. And the generator-inverter is about the size of a small microwave.
I was able to get it for 100.00 off normal price on the Black Friday sale, and they are shipping it free. Home Depot.