I'm still a long ways away from committing to anything, but my thinking is that I'm only going to buy the minimum that I need to survive comfortably, but not worry about powering everything. I also have two 200 amp panels that are on different sides of my house. Natural gas is available, but not connected to my house yet.
Number one for me is going with a super reliable brand. I don't believe Honda make a natural gas generator, so I'll have to find something of that caliber.
For the last 7 years, I've managed with a small Honda 2200 generator. It powers the TV, the internet, a few lights and charges our phones. It's not enough to power the heaters in the water tanks for our livestock, and that's really what I'm needing more then anything else. The house is heated with wood.
My thinking is that I'll run lines through my walls to where I need power from the generator, and install outlets that are only good when the generator is on. When I lose power, I'll just plug into those outlets. Kind of a cleaner approach then the extension cords that I use now. I plan to somehow label or mark, or do something to show that they are for the generator in case I'm not home if we lose power, or somebody doesn't try to use them when the power is on. To me, this should be pretty basic.
The advantage to a portable generator is the cost, and ease of replacing it if I need to.
Before I buy, I'll do a load chart to figure out what I absolutely need to power, and then decide on the generator after that. Until then, we've done pretty good off of the little Honda.