Both are extremely well built, reliable knives. They are very close to the same size, have blades of the same steel, thickness, and grind. Their handles also are equally thick and of identical materials. The only real difference in their blades is the shape, with the Chinook blade having more belly, a higher, more acute tip, and a more pronounced thumb ramp. Its Spyderhole is also positioned a bit further from the pivot, which might be a factor if, like me, you have fairly short thumbs. The big difference is in the "saddle" area of the handles and all I can really say is that one of them will almost certainly feel better to you than the other. Which of them will be that one is pretty much impossible for anyone but you to tell. Best bet would be to visit a B&M that stocked both and compare the feel, but if you cannot, the "good news" is that both hold their values quite well, so buying both and selling off whichever one you like the least would not be a total waste of money.
As for me, I find both "a bit" too bulky for EDC, but, if I were going on a "wilderness adventure", I'd take the Manix and if I were ever to go big game hunting again and "had" to carry a folder, I'd take the Chinook III. If that sounds like a waffle, it is.
These shots show the Manix and the Chinook II side by side. Aside from the grind, the Chinook II and III are identical.
Paul
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Spyderco Collector # 043 - - WTC # 1458 - 1504 - 1508 - Never Forget, Never Forgive!
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