Wow Propane! I would never have thought about Propane as a 3rd fuel option. I do have a Propane supply as I always keep a spare 5 gallon cylinder for the grill. I must admit, I really haven't done any research on propane power. I'll check it out. Thanks for your help

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1985 300D Turbo California Model (134K)

With any of your options, you need to determine how long you need the generator to run.

If you anticipate a 24 hour outage, the propane system is fine. But, what if you need to go one week? You certainly won't have storage of one week of propane and what's the odds that you can go out and buy it in sufficient quantity during the outage? The folks that dispense might not have power to do that.

Gasoline is the least desirable option because you can never store and rotate enough of it.

Diesel is preferable if you already have a proven storage system of significant quantity.