Re-Fueling Stations: Both have home charging stations. But everybody who has a home has an electrical outlet. Compressed Natural Gas (CNG) has a recharge unit for home use, but not everybody has access to natural gas in their homes. The CNG unit also comes with an initial cost. Electrical Vehicles (EV's) can be recharged in more places than CNG stations cover. Initially an extension cord can be ran to the EV. Eventually it will not be hard to add plug in units to parking areas. CNG stations come with high initial infrastructure cost. I think Electrical Vehicles win this one.
Range: How many times have you been out on the town and your cell phone battery is dead? Electrical cars practically run on the same batteries. Those batteries have a lot of new technology and innovation in them but they are still limited, expensive, heavy and inefficient. Natural Gas engines are not much different than the engines we use now. Gasoline and Diesel engines can be converted to run on CNG. CNG vehicles get similar gas mileage to gasoline therefore a full tank will get them just as far. CNG is more efficient for large delivery vehicles, public transportation, trash collection and fleet vehicles. I give this one to Natural Gas.
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Cost: General Motors (GM) new Volt EV retails for over $40,000 before tax incentives. Ford (F) has a Hybrid EV that runs on batteries until it runs low, then a gasoline powered generator runs the engine. It starts at $28,000 before tax incentives. Honda makes the only mass produced CNG vehicle in America, the Honda Civic GX starting at $25,450. Cummings Westport has a production CNG engine for the traditional diesel market. For large vehicles or heavy vehicles, EV is not even an option because of the size the batteries that would be needed. I would award this column to Natural Gas (CNG) too, BUT...... It seems that the momentum is clearly behind the Electrical Vehicle.