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One major difference is that hydrogen tanks are subject to embrittlement: https://en.wikipedia.org/wiki/Hydrogen_embrittlement

For a start, propane does not leak through solid metal.

It also requires much smaller pressures to be useful.

I think that a better analogy would be a big tank of acetylene connected to a complicated chemical reactor.

Propane does not concern me. A big tank of acetylene would be of concern to insurance companies, the fire brigade and the local safety agency.

At least in the US, there are regulations for placement of a propane tank that depends, among other things, size and capacity of the tank.

natural gas is a lot easier to store than hydrogen gas. Hydrogen atoms are small, permeate most materials, and rust metals into hydrides.

>Hydrogen atoms are small, permeate most materials, and rust metals into hydrides.

Hydrogen also has very low ignition energy, wide band of flammability (LEL to HEL), and requires usage of comparatively more expensive materials for handling.