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From an environmental perspective the well to wheels is the most all encompassing. However it is impossible to come up with an accurate universal number. How is "your" electricity made? In some areas it is mostly hydro, others areas wind, solar CNG or coal. Which area are you going to use or are you trying to come up with an ever changing worldwide average that keeps changing the advantage of one vehicle over another even though the vehicles didn't change? Just from my location I have a nuclear plant 70 miles to the east and another 120 miles to the west, a coal plant 30 miles north and a CNG emergency back-up plant 3 miles to the south? How much carbon does "my" electricity produce?
From an economic perspective, who cares? I have no control over the cost of producing either except that I would have the option of generating my own electricity and or hydrogen. I can see the price of gas and the cost of electricity and it is pretty simple to compare the cost per mile. And that hits me every time I have to "power up" regardless of the power source.
If you want to compare just the vehicles you have to compare pump price/content to what you as a consumer gets out of your receptacle and ignore what is going on up stream of that.
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