This is really a tough one for me. Even though the Wenger is billed as a hunting knife, I like the tip of the miniAFCK better for cleaning squirrels, compared to the Wenger Jr. But in general, the Wenger is a better slicer and I think the steel has a better heat treat.
And I like partially serrated blades but my Wenger Jr PS has too many serrations for me so again I give the nod to my miniAFCK. It has the right number of serrations for a combo blade.
In Michigan the blade length is limited to 3" but I fudge a little with the miniAFCK. I like the little bit of extra length. And for some odd reason, although I love the looks of the Wengers, the styling of my miniAFCK just grabs me. It's been my steady carry for me ever since I bought it, even though it's not nearly as smooth as either of my Wenger Jrs.
If the Wenger Jr PS had less serrations, I would probably carry it more often. I like my Wenger Jr smooth and I prefer the grind of the edge on the Wenger Jr to the miniAFCK but the right number of serrations on the miniAFCK work better for me for daily carry.
I don't have a full size AFCK so can't comment on that. But the full size Wenger is awesome as a hunting knife for large game. I've used it for slicing large cuts of meat and it's excellent.
In summary, the Wenger (i.e., the Jr.) has better blade geometry, is much smoother in action, and has a better heat treat (IMO), but I carry the miniAFCK regularly 'cause I like it's looks, the right PS combo, and...I'm sure there's some other reason but it escapes me for the moment.
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Hoodoo
Doubt grows with knowledge.
--Goethe