Well, this particular blog seems to think that the options are either anhydrous ammonia, hydrazine (!) and pure hydrogen peroxide.
If that particular mix is your entire range of choices, I guess ammonia might not be so bad.
But maybe they should keep looking for something a little less corrosive/poisonous/explosive? To be fair, if those are the criteria, hydrazine would be just about the perfect fuel!
Whatever happened to the claim that cars will run on water?
Well, at least if they choose hydrazine we’ll have a usable fuel for our personal spaceships as well.
Amazing that people never understand that the range of hydrocarbons from diesel oil to high octane gasoline constitute ideal fuels depending upon your specific application. But yeah, I see the attraction of hypergolic rocket fuels - so long as you keep it in your neighborhood and not mine.