I currently own 2 afcks and I feel that they may be the most perfect defensive folding knife. I have yet to get a military but most likely will in the near future. The afck offers you a better lock, stronger tip and a more secure grip. It also offers you a multi possition clip. The military is liter and thiner which is good. As bors said, the afck is a fighting knife that can be used for utility, and the military is more of a utiliy knife that can be used for fighting.
I would just say that if you want a knife for defensive purposes, get the afck with out a doubt.
People like to disrespect and underestimate a knife as a defensive weapon, (just get a pistol). But if you would rather have a knife, for one reason or another, there are plenty to choose from that can be used quite effectivly in offering yourself adiquite protection in many different situations. -That's how I feel personally.
Other knives to consider in that price range would be the commander,cqc-13, chinook, civlilian, or a nice sized microtech. Still, I would, and do go for the afck as my #1 choice. But you would not be disopionted in the military either I don't think.
And hey, getting both might be a good idea if you can. Also, I know the waving of non-emerson knives seems to be falling out of favor lately, but I do keep a tip tie on my 806 and it works at least aswell as on any emerson Ive had. (something to consider)
I hate making choices like this myself too, but good luck with yours.