Can I suggest you look at the efficiency of electrolysing water for Hydrogen production, compression, storage, transmission, storage again and then fueling and Hydrogen vehicle, and then compare that to putting the Electricity used to generate that Hydrogen straight into a battery?
Hydrogen cars are going to cost around 5 times more per kilometer to run than a BEV.
Even so, I think there will be a limited market for Hydrogen powered vehicles alongside what will ultimately be much more desirable a BEV.