Edward
For a home it all depends on the area. Oil (diesel fuel) may be cheaper. Call some vendors of each in your area and ask them about it. I believe propane is much cleaner burning though and better for the enviornment.

raven_080
Well if you use propane for a vehicle and you crash you can blow up..its cheaper then gas. Just dont lite a match in your home it might blow up :O

PropaneBrain
Propane is 20-40 % cheaper to use than electricity, depending on the appliances installed. Contrary to public opinion, Propane has a higher safety rating than electricity. (Most home fires are caused by electrical fires.)