So it looks like the cup charger is superior for charging. I'm not too worried though.
I've got a Biolite on order. The reason I bought it was I had one of those battery powered "Wood Gas" stoves, and I loved it. I looked at the biolite as a more compact version of that which I wouldn't need to buy batteries for, and could be used to charge up phones etc. in an emergency. Charging things was not the primary reason I bought it.
In the role for which I want it, it looks like the Biolite will be the business.
The cup charger is really expensive as well. If all you want is to enhance the endurance of your phone, buy one with removable batteries. For the price of the cup charger you could buy 5 or 6 spares. Unless you absolutely need to be able to charge electronics far from civilisation, the Cup Charger doesn't make sense to me.
"He that breaks a thing to find out what it is has left the path of wisdom."