Propane vs Electric Heating

So I know this will vary widely by location, but I live in Southern California and I'm curious to know which would be the more cost effective solution. Electricity out here is expensive, but I think propane is too. Does anyone out here in SoCal have any experience with both that can shed some light on the cost of each? If it's about the same, I'll probably invest in some space heaters so I don't have to lug the tank to refill so often.