I'm pro-everything. From my flawed knowledge of economic history, energy rules all and is the single best thing to invest in for a country or civilisation's future. [1][2][3][4][5]
Any advantages individual technologies have in energy generation, transportation or storage is probably worth exploring.
I hope to have more insight in this when I get around to reading Vaclav Smil, or better yet work in the energy industry as it seems to be one of the few industries I've looked at that definitely needs to exist.