[mikeash]

The downsides of hydrogen are that it's less efficient than batteries, it's considerably more expensive than electricity (because it's less efficient, and because you have to pay for additional infrastructure to produce, distribute, and store it), and it's generally not available for purchase.

Give me a Tesla and I can charge it anywhere there's electricity. If there's no dedicated charging station, then I can still charge it from a regular wall socket, albeit slowly. There are also a ton of charging stations around here.

Give me a fuel cell vehicle and I can't refuel it anywhere near here. According to the Department of Energy, there are 11 public hydrogen filling stations in the US:

http://www.afdc.energy.gov/fuels/hydrogen_locations.html

You list "no charging stations" as a con for batteries, but it's really not bad at all, and the hydrogen situation is vastly worse, and I don't see it getting better with any kind of speed.