my $.02:

I would prefer the Bic. If I understand correctly this is an emergency kit, right? So don't use the lighter unless you need it, and if you do then replace it after the emergency is over. The not being able to see how much fuel is left seems to be a moot point if it is considered in this way. Lighters are cheap, and for an emergency kit it doesn't make sense, to me, to sacrifice quality for the ability to see how much fuel is left in it.

ME you bring up a good point about testing the lighters before you put it in the kit, I think you should make the fact that you inspect the gear going in to each kit more apparent on your website. I know for me it makes me feel a lot better about ME as a company. If you inspect each lighter, then throwing out the bics that have a low flame should be an option for you.

Standard Disclaimer:
I don't know everything, and the above is just my imperfect opinion.