There have been more investments and longer development times in battery tech than in hydrogen tech. I believe we should develop both. Who knows what amazing results hydrogen tech can achieve once it's fully developed? Perhaps once hydrogen tech is optimized, it can be synthesized from anywhere (say a boat on sea, or on the moon once water is found) and may provide a higher energy density than any other storage form (solid hydrogen storage is being investigated as it is). Perhaps rockets will make use of new hydrogen tech. Perhaps it can be used to create drinkable water in space, from non-drinkable components.

We should give it a chance before focusing only on batteries, as we would miss out on possible amazing tech by focusing only on batteries.