Unfortunately, I do not own any of yours, so I am speaking of just the patterns in general. With that in mind, I prefer the Kephart, and here is why.
Back in the day of both Nessmuk and Kephart, going into the outdoors was a bit different. I mean, when was the last time you were able to pick hemlock browse for your bed, cut down green stick for your tent structure, or cut down a green tree as fire backing/reflector? Today, we have much more gear, requiring us to use tools less. Another example is many people take a cook stove of some sort. Even though I would like to, I have not made a 5 foot log stove before.
With that in mind, people like Nessmuk/Kephart always talked of using a combination of tools, including a hand ax. The sheath knife was generally one of 3. This allowed the sheath knife to have a much more
specific use. Today, with all the gear we have, not requiring to do as many things with natural materials, many people forgo the hand ax, and carry a couple knives.
I typically do take a hand ax in my daypack, but there are obviously times when I do not. If I have an ax, either design is sufficient. But, when I dump it, it will now require my knife to do more work (not be as specialized) as it was before. Therefore, I want one that can do as many things well as possible.
For that, I think the Kephart design has a bit of edge. At least for me anyway. Your mileage may vary
My 2 cents.
Brian