Depends on driving habits and price of electricity and gas. In Washington state, electricity is cheaper compared to most of the US, and gas is among the most expensive compared to most of the US.

For less than ~10k miles per year, the higher up front cost of an electric vehicle and the greater depreciation due to eventual battery replacement might make a hybrid gas vehicle still cheaper per mile.

But for high mileage, high frequency of stop and go driving, I imagine all electric is cheapest?