I think that blade length, knife choice, and even kit issues are up to the individual outdoorsman. That said, I suppose a person really has three categories of knives to choose from.
1) Pocket folding multi tools - SAK's, Gerber's, and Leathermans.
2) Short fixed blades - Frosts, Fallkniven, etc....
3) Rambo "I've got a twelve inch blade and I'm going to chop down a tree with it." style knives. The Ka-Bar comes to mind as I write this.
I'm quite happy with my Frosts, but I'm also very happy with my collection of SAK's. But as they say.....Different Tools for Different Jobs.
Adam