Get the AFCK. G-10 scales w/SS or Ti liners beats pure zytel anytime. And the AFCK's are linerlocks, which I prefer to the Ascents' lockbacks. The AFCK feels a lot better, smoother, stronger. They look like the handle is the same shape, but if you hold them side by side, the AFCK feels a lot better. The only time I would suggest an Ascent over an AFCK is if you need to fit under a 3" blade for legal reasons.
And I've heard that BM's black coating will scratch under hard use, but none of mine have scratched at all (yet).
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Jason aka medusaoblongata
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"I have often laughed at the weaklings who call themselves kind because they have no claws"
- Zarathustra