The argument would be about whether it's a better plan to 1. Power cars with batteries charged from the grid or use 2. "Green" hydrogen, i.e. from cracking H2

The argument would be about whether it's a better plan to 1. Power cars with batteries charged from the grid or use 2. "Green" hydrogen, i.e. from cracking H2O with solar, or use 3. Synfuel derived from CO2 and green hydrogen, i.e. using the synfuel as a "battery", the output being CO2 and H20 again.