I think there's a risk of "it's too soon to say here" when deciding on fuel vs battery Vs hydrogen. The problem is that this is a highly complex dynamic system with different people experiencing different externalities.

Reasons answering this question is difficult are, for example:

- given the demands for highly valuable electricity and alternative use cases, why do we insist on using it in locomotion?

- given marginal electricity pricing, everyone is subsidising cleaner air in cities for the benefit of air quality of only those living in cities

- might electric buses be prevalent because of smaller up front costs to infrastructure, and not because it's the right thing longer term?

- if electrification of transport in general was a bad idea (first bullet) then how does this change the economics of hydrogen given the longer run access to SMR sourced hydrogen from longer term fossil fuel extraction?

- how sure are we that we are solving a co2 climate crisis with the actions we are taking?

This all in the context of "greening" our economies when all the dirty industry and carbon emissions are exported to China, out of sight but not out of the true equation. And then there's the destruction of industrial capacity in Europe carried out by green agendas, all in favour of the Chinese Communist Party longer term.