I'd still suggest propane. Coleman fuel eventually goes bad. I've had containers of fuel that went bad in a year and wouldn't burn in the stove. Your mileage will vary.

As others have said, the fuel is gasoline, and storing gasoline is a problem. Propane in containers is at least as safe as gasoline, maybe safer, but whatever your volatile fuel, is should not be stored in the house and should be stored where the fumes can waft away.

I'd suggest asking your wife to do some research on safe storage of fuels and make a decision on what she wants - compare safety and long-term storage. I'd be she'll choose propane. I used to live in the country and we had (at different times) propane and butane as our fuel for home heating and cooking. Butane was stored in an underground tank, and propane above ground. Millions of people get their home heat and cooking from gas stored on their own property, as we did.