Kriss vs. AK-Knife

Title says it all.
I'm approaching 80 coupons and want both of these guns.
I already have AK-Camo (for like 90 Days) and AK-Silver. I've also heard that AK-Knife is harder to control, is it worth it?

I already have tommy. And I heard kriss was one of the best SMGs. I also heard that M12 is way better. (No, I'm not going to buy M12)
Which one and why? o.O
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