Of the three knives you're interested in, I have the 15 and the Commander. The Commander to me feels more ergonomic because I prefer a concave grip over one that has a belly. That being said I actually prefer the 15 over the Commander. Oxymoron right? I don't care much for the large belly in the blade on the Commander, not as good for poking things (think gutting a fish). Also I find the shallower recurve of the 15 easier to sharpen. I really like that the tanto angle of the 15 isn't so obtuse that it becomes a hinderance when using the tip and there is still a useable point.
To summarize, I find the 15 to have a better/ more useful blade tip design and the recurve is easier to maintain. Hope this helps
To summarize, I find the 15 to have a better/ more useful blade tip design and the recurve is easier to maintain. Hope this helps