Hydrogen is the *element* of choice because the binding of hydrogen to oxygen releases energy and that’s what powers a fuel cell or a burning reaction. Hydrogen is also the most abundant element in the universe.
Pure hydrogen is seen, on top of it, as an environmentally friendly choice because after you bind all the hydrogen to oxygen you end up with water.
That said, renewable hydrocarbons might turn out to be better fuel because producing pure hydrogen and transporting it has significant costs and challenges. But even when hydrocarbons are used as fuel, most of the energy is coming from the reaction of the hydrogen in the hydrocarbon with oxygen, so you can think of them as a different way to package hydrogen.
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