It isn't purely about the (energy density of the) chemicals themselves, but also about the available reformation / hydrogenation processes. As far as my limited

It isn't purely about the (energy density of the) chemicals themselves, but also about the available reformation / hydrogenation processes. As far as my limited knowledge goes, the processes for methanol have seen more development, but formic acid has a potential for simpler and smaller systems in less demanding circumstances (pressure, heat). [1] was the first comparison I stumbled upon. [1] https://doi.org/10.1515/9783110536423-002 https://doi.org/10.1515/9783110536423-002