Which fuel to use for a generator is only slightly less polarizing than asking which god to you pray to or who you voted for president.
My choice was pretty simple. I have more diesel engines on the property than any other fuel type. I'm able to go get fuel myself (assuming its not sold out during an "event"). Its relatively safe to store and when properly treated and in good environmental conditions can be stored for an extended time.
I like Propane from a fuel stability standpoint. Its hard to beat it in long term storage situations nor does it clog up carburetors. If I ran a generator once every few years for a limited time, I'd probably have one. Why I don't have one is due to cost of fuel and the necessity of having to rely on a delivery service to bring a sufficient quantity to run a generator for a few days. In years past the generators got regular workouts during power outages. Now that I have solar with battery backup, I run them a LOT less. In the last couple of years I've burned more fuel load testing than in actual use. Sad but true. Sounds like I'm talking myself into a propane generator! hahahza
Between 3 diesel vehicles (only the wifes car is gas), 2 diesel tractors, one diesel excavator, and an embarrassing number of diesel generators, fuel rotation is never a problem. I can easily draw fuel from vehicles to power generators if there was a need.
I do have a couple of the honda inverter based gas generators. Those were both purchased for a RV habit I had about 15 years ago. Both run perfectly fine to this day since I don't use gasoline containing alcohol in either of them and I run them dry before storage. The EU3000i sat for like 10 years untouched in the camper. Last fall for kicks I cleaned out the fuel tank, put some fresh gas in it and it started on the FIRST PULL. No complaints there.
If there is one PSA I can offer in all this rambling its this - find non-ethanol fuel for all your small engines. There are websites dedicated to listing alcohol free gas locations. Never run that crap in anything other than vehicles that were designed for it.